(1) Firmly insert the center guide into the center of the area where you want to drill the hole
(2) Slowly turn it clockwise with light force
(3) Dig to the desired depth
- Set of 3 3.5mm, 3.6mm, 3.7mm
- The thickness of the shaft is unified to Φ3 mm, saving the trouble of replacing the collet chuck of the pin vice when replacing it
- Comes with a case for easy storage and transport
