rock drilling tool,Button bits,rock drill,threaded,tapered,drilling tools,drill bit,drill bits,rock drilling tools 1. Button bits: Tapered button bits (28mm, 30mm 32mm, ... 42mm, 44mm and so on with different degree taper) Thread Button Bits (33mm, 35mm, 45mm to 89mm, 102mm and so ... , R25, R28, R32, R38, T38, T45, T51 etc.) Retrac Button bits with different Thread different diameters. 2. Dth bits: From ...