Super cement drill bit(for special use, used in tungsten steel die production, high strength armored concrete), reference of front cutting-edge profile of center drill bit/chamfer drill bit/profile drill bit, high-grade high-cobalt powder steel tooling(center drill bit/chamfering drill bit/forming drill bit), super-fine twist drill (ultra micro-grain quality carbide/high-grade high cobalt powder steel), ultra micro grain quality carbide tooling series(hsc).
According to drawings and samples