These are drill bits for precise drilling metal with different viscosity. The GRAFF brand produces drill bits with 4 mm diameter for self-locking or cam cartridges. They are made of strong HSS 4341 steel. This material deals with many metals and provides high accuracy class B1. This drill bit can be used to drill holes without additional operations. It is ensured by cross sharpening and its optimal angle.
Drill size: – 4x43x75 mm where 4 mm is diameter, 43 mm is working length and 75 mm is total length.