drill bit,drill bits,rock drilling tools,rock drilling tool,Button bits,rock drill,threaded,tapered,drilling tools 1. Button bits: Tapered button bits ( ... taper) Thread Button Bits (33mm, 35mm, 45mm to 89mm, 102mm and so different degree Thread for example: R22, R25, R28, R32 ... . 2. Dth bits: From 115mm, 120mm, to 165mm, 178mm and 270mm and 310mm, The shank can be designed according to different hammer ...