They are hardly suitable for aluminium. Definitely not for steel. For hard materials it is better to buy a proper tap. 3 stars because they are cheap.
Bit and socket set BOSCH Promoline (2.607.017.322), 26 pcs.
24 Review
Cordless drill driver BOSCH GSR 120-LI (06019G8020/06019G8000)
54 Review
Impact screwdriver Makita TD0101F, 230 W
31 Review
๐งฑ Bosch 2607017164 Piece Setter Masonry: Advanced Tools for Precision Masonry Work
20 Review
๐ช DEWALT DW3984C Portable Blade Set of 3-Pack
10 Review
Enhanced Cutting Efficiency with Olson FB23370DB 0 025 2 Inch Blade
Chest freezer Biryusa 155KX, white
16 Review
๐ช Bi-Metal Cutting Blades: Imachinist S933414 - Enhancing Precision and Performance