- HSS material spiral grooved step drill cut tool
- Drilling perfectly round holes in steel, brass, copper, aluminum, wood and plastic, pvc sheet, insulation boards, thin iron
- Drills up different sizes holes with one bit
- Burr-free and vibration-free drilling
- Double spiral groove, fast chip removal - effectively block metal chips and damage due to splashing
- Iron plate/aluminum material opening
- Heat-treated
- Clear laser marking scale
- 118 degree X-shaped opening reduce drill bit slip
- 2mm/step
- Universal secure handle - does not slip easily, firm and durable
- Titanium coating surface
- Packed by double blister
- Size: 4-20mm
- Length - 73mm
- Height - 8mm
- Material - HSS
- 4mm-12mm
- 4mm-20mm
- 4mm-32mm
- Electric hand drill
- Lithium hand drill
- Bench drill
