Description:
【Two-Flute Spiral Groove Design】Enables a faster, more stable and smoother cutting. It can automatically chamfer the hole to clean the drill bit. 
【HSS & Titanium Coated】Made of super strong HSS steel and coated with Titanium, Titanium coating ensures easy cutting steel, Aluminum sheet, Brass, Copper, plastic, wood etc.
【Application】Suitable for sheet metal, sink, car repair, etc. Widely used to cut holes in a variety of material like plate, aluminum, insulation board, PVC board.
【Convenience】Step drill allows to cut several sizes hole with one drill bit, easily without changing bit constantly.

Specifications:
Size: 4-12mm\4-20mm\4-32mm
Material: high speed steel
Colour: Black
Features:Quick Release
Type:Drill Bit
Sub-Type:Drill
Features:Titanium Cone Drill
Model:Spiral step drill
Quantity:3Pcs

Include:
3 x Spiral step drill bit
1 x storage bag