M35 5% Cobalt HSS Step Drill Bit HSSName: M35 5% Cobalt HSS Step Drill Bit Material: 5% Cobalt High Speed Steel Drill bit shank: Hex shank Punch size: 4 12mm (4 5 6 7 8 9 10 11 12mm) 4 20mm (4 6 8 10 12 14 16 18 20mm) 4 22mm(4 6 8 10 12 14 16 18 20 22mm) 6 24mm(6 8 10 12 13 14 16 18 20 22 24mm) 4 32mm (4 6 8 10 12 14 16 18 20 22 24 26 28 30 32mm) Packing: Clear plastic box Application: Widely used to cut holes in a variety of materials like stainless steel tapping steel, wood, thin