The GISAM 26mm brushless rotary hammer and the Mamidw 20V 2.2J brushless rotary hammer are two relatively inexpensive cordless tools designed for drilling into concrete, brick and masonry. Although they may appear to target the same buyer, their specifications reveal several important differences in operating modes, battery compatibility and the way their performance is documented.
This comparison covers the GISAM AliExpress item 1005008640241669 and the
Mamidw AliExpress item 1005012873010801. Specifications were checked against the product listings and publicly indexed product documentation. Information checked on
The GISAM is the more versatile tool on paper because it offers four operating functions and a confirmed 26mm maximum drilling capacity, while working with selected Makita-style 18V B-series batteries. The Mamidw is a simpler two-mode rotary hammer compatible with the DeWalt 20V battery platform, but it has one major specification advantage: the seller explicitly states an impact energy of 2.2 joules. Both advertise a brushless motor and an impact frequency of up to 4,800 blows per minute.
GISAM vs Mamidw specifications
| Specification | GISAM 26mm | Mamidw 20V 2.2J |
|---|---|---|
| AliExpress item ID | 1005008640241669 | 1005012873010801 |
| Motor | Brushless | Brushless |
| Battery platform | Makita-style 18V B-series | DeWalt 20V battery interface |
| No-load speed | 0–3,500 RPM, seller stated | Up to 1,200 RPM |
| Impact frequency | 0–4,800 IPM | Up to 4,800 BPM |
| Impact energy | Not clearly specified | 2.2 J |
| Maximum drilling diameter | 26 mm | Not explicitly stated on the supplied exact listing |
| Tool holder | SDS / SDS-Plus documented | Rotary-hammer type holder shown; exact specification should be confirmed with seller |
| Operating modes | 4 functions | 2 modes |
| Drilling mode | Yes | Yes |
| Hammer drilling | Yes | Yes |
| Chiselling | Yes | Not specified for this two-mode version |
| Chisel position adjustment | Yes | Not specified for this two-mode version |
| Safety clutch | Not clearly specified | Advertised in product material |
1. GISAM 26mm brushless rotary hammer
What are the confirmed GISAM specifications?
The GISAM is an 18V cordless rotary hammer with a brushless motor and an SDS-type bit holder. Publicly available specifications consistently give a maximum no-load speed of 0–3,500 RPM, an impact frequency of 0–4,800 impacts per minute and a maximum drilling diameter of 26 mm.
The manufacturer and seller describe it as suitable for granite, structural walls, lightweight concrete and brick. The tool uses round-shank bits with the typical two-groove and two-slot SDS-Plus arrangement.
Four operating functions
One of the GISAM’s strongest practical advantages is its four-function selector. The documented functions are:
- Drilling mode – rotation without hammering; a conventional drill chuck or adapter may be required for standard drill bits.
- Hammer drilling – rotation combined with pneumatic hammer action for concrete, masonry and brick.
- Chisel positioning – allows the angle of a flat chisel to be adjusted.
- Chiselling / electric pick mode – intended for light demolition, chasing and removing material without rotation.
This makes the GISAM more than a concrete drill. It can also perform light chiselling and wall-chasing work that a two-mode rotary hammer cannot perform.
GISAM battery compatibility
The tool is designed around the Makita-style 18V B-series battery interface. The documentation specifically lists compatibility with batteries including BL1830, BL1840, BL1850, BL1840B, BL1850B, BL1830B and BL1820B.
A battery capacity between approximately 2.0Ah and 5.0Ah is recommended. Sets supplied with batteries are commonly advertised with 3.0Ah packs.
Importantly, the tool is specifically described as not compatible with Makita G-Series batteries such as BL1813G, BL1413G, BL1415G, BL1430G and BL1815G. It is also not intended for older 18V Ni-Cd packs.
2. Mamidw 20V brushless rotary hammer
What are the confirmed Mamidw specifications?
The exact Mamidw version compared here is advertised as a 20V brushless cordless rotary hammer for the DeWalt 20V battery interface. Its headline technical figures are 1,200 RPM, 4,800 BPM and 2.2 J of impact energy.
The stated impact energy is particularly useful when evaluating a rotary hammer. RPM tells us how quickly the bit rotates and BPM tells us how often the hammer mechanism strikes, but the energy of each strike is expressed in joules. For drilling concrete, that figure provides additional information that RPM alone cannot provide.
Two operating modes
The exact AliExpress version supplied for this comparison is explicitly marketed as a two-mode tool. The product graphics identify:
- Drill mode
- Hammer drill mode
This is an important distinction because other Mamidw rotary hammers found online are advertised with four functions. Those products should not automatically be treated as the same model. The exact item compared here is the 1,200 RPM / 4,800 BPM / 2.2 J two-mode version.
DeWalt battery compatibility
The Mamidw is marketed for a DeWalt 20V battery interface. This potentially makes it attractive to buyers who already own compatible DeWalt-style battery packs and do not want to invest in another battery ecosystem.
The product image for the selected set shows a battery and charger and depicts a battery marked 6.0Ah. Buyers should nevertheless check the exact battery capacity included in the selected AliExpress variant before ordering because accessories can differ between package options.
Safety clutch
Mamidw’s listing also advertises a built-in safety clutch. A clutch in a rotary hammer is useful when a drill bit suddenly jams because it is designed to reduce the rotational reaction transmitted to the operator.
Which is more powerful: GISAM or Mamidw?
A direct power comparison cannot be made solely from the headline numbers.
Both tools are advertised at up to 4,800 impacts per minute. The GISAM lists a substantially higher maximum rotational speed of 3,500 RPM versus 1,200 RPM for the Mamidw, but higher RPM does not automatically mean stronger concrete drilling.
For a rotary hammer, impact energy is one of the most useful figures for estimating how much energy the hammer mechanism can deliver to the bit. The Mamidw provides a stated value of 2.2 J, while an equivalent joule rating was not found in the published specifications for the GISAM model.
the Mamidw’s 2.2 J figure allows its hammer mechanism to be assessed more easily. The GISAM’s 4,800 IPM figure tells us how frequently it strikes, but without a verified joule rating it is not possible to conclude from the specification sheet alone that the GISAM hits harder or softer.
Which one is better for drilling concrete?
For normal holes in concrete and masonry, both tools are designed for the job. The Mamidw has the advantage of a clearly published 2.2 J impact-energy rating, while the GISAM has a documented maximum drilling diameter of 26 mm.
For anchor holes, wall plugs and typical renovation work, either design should provide considerably more appropriate hammer action than an ordinary hammer drill because these are rotary-hammer type tools.
Buyers expecting to drill large-diameter holes continuously in reinforced concrete should, however, avoid treating seller specifications as a substitute for independent performance testing. Neither of these exact products has the same depth of independently published laboratory data normally available for major professional tool brands.
Which one is better for chiselling and demolition?
This is the clearest functional difference between the two products.
The GISAM is the more versatile option for chiselling because its documentation explicitly provides both chisel-position adjustment and a dedicated electric-pick/chiselling mode.
The exact Mamidw compared here is advertised with only drilling and hammer-drilling modes. Therefore, a buyer who needs to remove tiles, cut narrow channels, remove plaster or perform light demolition has a clearly documented additional function on the GISAM.
Makita battery users vs DeWalt battery users
For many buyers, battery compatibility may be more important than the small differences in headline specifications.
| If you already own… | More logical option | Reason |
|---|---|---|
| Compatible Makita 18V B-series batteries | GISAM | The GISAM is specifically designed around this battery interface. |
| Compatible DeWalt 20V batteries | Mamidw | The Mamidw is designed for the DeWalt 20V battery interface. |
| No compatible batteries | Compare complete sets | Battery and charger cost can change the overall value considerably. |
What about the prices?
The screenshots checked on 27 September 2026 showed approximately PLN 165.39 for the GISAM and PLN 224.99 for the Mamidw.
GISAM advantages and disadvantages
GISAM advantages
- Brushless motor.
- Four documented operating functions.
- Dedicated chiselling function.
- Chisel-angle adjustment.
- 26 mm stated maximum drilling diameter.
- 0–4,800 IPM impact frequency.
- SDS/SDS-Plus system is clearly documented.
- Detailed list of compatible Makita-style batteries is available.
- Tool-only and battery-set variants are available.
GISAM disadvantages
- No reliable impact-energy figure in joules was found for the exact model.
- The advertised 3,500 RPM figure is unusually high for a 26mm SDS rotary hammer and should be treated as a seller-stated specification rather than an independently verified measurement.
- Published weight information is inconsistent between different indexed documents and package versions.
- Not compatible with Makita G-Series batteries.
Mamidw advantages and disadvantages
Mamidw advantages
- Brushless motor.
- Clearly stated 2.2 J impact energy.
- Up to 4,800 BPM.
- 1,200 RPM no-load speed.
- Compatible with the DeWalt 20V battery platform according to the listing.
- Advertised safety clutch.
- Simple two-mode operation.
Mamidw disadvantages
- Only two operating modes are advertised for this exact version.
- No dedicated chiselling mode is shown for this version.
- The exact maximum concrete drilling diameter is not clearly specified in the supplied product page.
- Less independently indexed documentation is available for this exact Mamidw SKU.
- Several different Mamidw rotary-hammer versions exist online, making it important to compare the exact listing rather than specifications from visually similar models.
GISAM vs Mamidw: which one should you choose?
you already own compatible Makita 18V B-series batteries, need a documented 26mm drilling capacity, or want to use the tool for both drilling and chiselling.
you already own compatible DeWalt 20V batteries, mainly need drilling and hammer drilling, and prefer a tool whose seller provides a specific 2.2 J impact-energy rating.
For a buyer starting without batteries from either system, the comparison becomes closer. The GISAM offers more functions, while the Mamidw provides clearer information about the energy delivered by its hammer mechanism. The contents of the selected battery kit and the final delivered price should then be included in the decision.
Frequently asked questions
Is the GISAM 26mm compatible with Makita 18V batteries?
It is designed for selected Makita-style 18V B-series lithium batteries, including commonly listed BL1830, BL1840, BL1850, BL1840B and BL1850B types. It is not compatible with the Makita G-Series battery interface.
Is the Mamidw rotary hammer compatible with DeWalt 20V batteries?
The exact product is marketed as being designed for the DeWalt 20V battery interface. Buyers should still compare the battery connector and the seller’s compatibility information with the exact battery they intend to use.
How powerful is the Mamidw hammer mechanism?
The seller states an impact energy of 2.2 J and an impact frequency of up to 4,800 blows per minute.
How powerful is the GISAM hammer mechanism?
GISAM specifies up to 4,800 impacts per minute and a maximum drilling diameter of 26 mm. A reliable impact-energy figure in joules was not found for this exact model, so its hammer strength cannot be directly compared with the Mamidw’s 2.2 J rating using specifications alone.
Does the GISAM have a chiselling mode?
Yes. The documented four-function selector includes hammer drilling, normal drilling, chisel positioning and a dedicated chiselling or electric-pick mode.
Does the Mamidw have a chiselling mode?
The exact 1,200 RPM / 4,800 BPM / 2.2 J product compared here is advertised as a two-mode version with drill and hammer-drill modes. Other Mamidw products sold online may have additional functions, but they should not be assumed to be the same model.
Is 3,500 RPM better than 1,200 RPM for concrete?
Not necessarily. Rotational speed is only one part of rotary-hammer performance. Impact energy, impact frequency, bit design, pneumatic mechanism efficiency and battery output all affect drilling speed in concrete. A higher RPM figure alone does not prove that one rotary hammer drills concrete faster.
Which model is more versatile?
Based on the documented functions, the GISAM is more versatile because it provides four working functions including chiselling. The exact Mamidw version in this comparison is focused on drilling and hammer drilling.
Final comparison
The GISAM 26mm and Mamidw 20V 2.2J are aimed at slightly different users. GISAM emphasizes multifunctionality, a 26mm drilling capacity and compatibility with selected Makita 18V B-series batteries. Mamidw emphasizes a simpler two-mode design, compatibility with the DeWalt 20V battery platform and a specified 2.2 J impact energy.
The most important technical difference is therefore not the 3,500 versus 1,200 RPM figure. Both tools advertise approximately the same maximum impact frequency of 4,800 blows per minute. The more meaningful differences are the battery platform, number of operating modes, availability of chiselling and the fact that only the Mamidw provides an explicit impact-energy figure for this exact listing.
Sources and product identification
- AliExpress – GISAM 26mm Brushless Electric Hammer Drill, item ID 1005008640241669.
- GISAM – Brushless Electric Hammer Drill, 26mm multifunctional rotary hammer product documentation.
- GISAM 26mm Brushless Electric Hammer Drill user documentation indexed by Manuals+.
- East Supplier – product record for item 1005008640241669.
- AliExpress – Mamidw 20V Brushless Rotary Hammer Drill, item ID 1005012873010801.
- PriceSpy indexed listing – Mamidw cordless hammer drill, 4,800 BPM and 2.2 J impact energy.
- Alibaba indexed product record – Mamidw 1,200 RPM brushless 20V cordless electric hammer.
Specifications may vary between package versions and seller revisions. Battery capacity, charger, accessories and current price should be checked for the exact option selected at checkout. Performance figures quoted above are manufacturer or seller specifications unless explicitly stated otherwise.
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