4-16.5mm HSS Step Drilll Bit For Wood Metal Hole Cutter Drilling Tools Spiral Groove Core Drill Bit

4-16.5mm HSS Step Drilll Bit For Wood Metal Hole Cutter Drilling Tools Spiral Groove Core Drill Bit

Features:

1. High speed steel material, more durable.

2. No need for a pilot hole, can automatically deburr holes as you drill.

3. Working with water cooling, can effectively extend the service life of bit, drilling speed 250--400 recommended. Widely used to cut holes in a variety of material like steel, wood, thin iron, aluminum alloy, insulation boards, PVC sheet , ect.