1,taper shank drill bit 2,drill bit 3,ground shank drill 4,micro carbide quick bits 5,tungsten carbide drill bits Our Facility: 6 ... , Grain size: 0.5um; High quality of wear ability and impact 2. Flute: 2-4FLUTE , Diameter: 0.5-30mm Tolerance: . 00 ... \OEM accepted8,We can also manufacture spherical drilling tool.drill,drilling rig,drill bit,power drill9,Material:Solid carbide steel(tungsten steel ...