DSTEPSET - 3 Piece Multi Diameter Step Drill Sets.
3 piece multi diameter step drill sets available in HSS, HSCo Cobalt and HSCo Cobalt TiN Coated. Designed for the machining of Sheet Steel and thin materials.HSS + TiN = hardness 63 HRC, to machine steels up to 800 N/mm², copper, brass, bronze, aluminium up to 6% Si. The TiN coating ? hardness 2300 HV increases the tool life by increasing wear resistance. Sizes included in Sets 12mm, 20mm, and 30mm