... type bits, Cross Bits,high pressure drilling tools, reaming bits, mineral pick cutter, chisel bits, tapered drill bits, down the hole bits, ... heat treatmentMore experiences in exporting with leading qualityTapered button bits (28mm, 30mm 32mm, 34mm, 36mm, 40mm, 42mm ... R32, R38, T38, T45, T51 etc.) Retrac Button bits with different Thread different diameters. Tooth type Spherical, BallisticDETAILED ...