It is widely used in cutting drill, barrel drill and other drilling tools. The alloy outer tooth body is strengthened to protect and treat. It is widely used and has superior comprehensive performance. The left one and the left two are suitable for 80 to 100 MPa, the left three, the left four and the left five are suitable for 60 to 80 Mpa. Crushed stone, pebble and other strong impact, hard grinding body fast geology, can enter rock core, appearance patent design, grinding body uniform, long service life.