3pcs 4-12/20/32mm HSS Step Drill Bits Set Spiral Grooved Hole Cutter

Includes:

1pc 4-12mm drill bit
5 Steps (4, 6, 8, 10, 12mm)

Shank Diameter (6mm)

1pc 4-20mm drill bit
9 Steps  (4, 6, 8, 10, 12, 14, 16, 18, 20mm)

Shank Diameter (8mm)

1pc 4-32mm drill bit
15 Steps  (4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32mm)

Shank Diameter (10mm)

Features:
118° X-shaped opening, to reduces slippage of the opening
HSS Drill Bit Set For Metal , Wood, Plastic And Aluminum.
Ideal For DIY, Home and General Building/Engineering Using.

Ideal For using to cut holes in a variety of materials including steel, brass, wood, plastic, etc.
High speed steel,durable.
Nitriding coated to reduce friction and heat.
Triangle shanks design in order to prevent slippage when in chuck.