HSS Step Drill Bit 4-32mm Cobalt M35 Spiral Groove Pagoda Stepped Reamer Hole Triangular Handle HSS Co Tapered Drill Bit DC17B

Much More Hardness - M35 HSS is much harder than HSS 4241, suitable for drilling stainless steel plates and quenching steel plates, iron plates, aluminum, wood.
Good Design: The triangular shank fits into the power tool chuck securely and eliminates slippage. The two-fluted design removes chips faster and allows particles to escape easily.
You can use water to cool it down when it works and it can be used even longer.
step drills: 15 steps (4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm, 30mm, 32mm ).
Contents: 1 M35 HSS Co drill bit from 4 to 32 mm.