... ,threaded,tapered,drilling tools,drill bit,drill bits,rock drilling tools 1. Button bits: Tapered button bits (28mm, 30mm 32mm, 34mm, 36mm, ... 40mm, 42mm, 44mm and so on with different degree taper) Thread Button Bits ... , T45, T51 etc.) Retrac Button bits with different Thread different diameters. 2. Dth bits: From 115mm, 120mm, to 165mm ...