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.
Impact screwdriver Makita TD0101F, 230 W
31 Review
Cordless drill driver BOSCH GSR 120-LI (06019G8020/06019G8000)
54 Review
Bit set DeWALT DT7969-QZ, 32 pcs.
39 Review
𧱠Bosch 2607017164 Piece Setter Masonry: Advanced Tools for Precision Masonry Work
20 Review
πͺ Bi-Metal Cutting Blades: Imachinist S933414 - Enhancing Precision and Performance
10 Review
Olson 80 Inch Blade FB14580DB-025
πͺ Durable DEWALT DW3986C Portable Blade 3 Pack for Efficient Cutting
πͺ DEWALT DW3984C Portable Blade Set of 3-Pack