Drill bit with hard metal insert on drill head has cutting edges of hard metal insert extending away from tip of drill bit in curved star shape to outer circumference of drill bit

摘要

The drill bit has a hard metal insert (10) on the drill bit head and extending transversely with respect to the drill bit head. The cutting edges (20) of the hard metal insert extend away from the tip (22) of the drill bit in a curved star shape to the outer circumference of the drill bit.