I've used them on soft metals and wood, they do their job and are fairly straight and as long as you ignore the pressure and let them do their job they won't bend. I'm afraid they won't survive steel, I'd use a higher quality bit for that!
Bit set DeWALT DT7969-QZ, 32 pcs.
39 Review
Bit and socket set BOSCH Promoline (2.607.017.322), 26 pcs.
24 Review
Tool set Ombra OMT94S12, 94 pcs, brown
27 Review
𧱠Bosch 2607017164 Piece Setter Masonry: Advanced Tools for Precision Masonry Work
20 Review
Enhanced Cutting Efficiency with Olson FB23370DB 0 025 2 Inch Blade
10 Review
πͺ DEWALT DW3984C Portable Blade Set of 3-Pack
πͺ Durable DEWALT DW3986C Portable Blade 3 Pack for Efficient Cutting
Olson 80 Inch Blade FB14580DB-025