... drill,threaded,tapered,drilling tools,drill bit,drill bits,rock drilling tools 1. Button bits: Tapered button bits (28mm, 30mm 32mm, 34mm, ... degree Thread for example: R22, R25, R28, R32, R38, T38, T45, T51 etc.) Retrac Button bits with different Thread different diameters ... customers requests. 7. Coupling with different thread for example R22, R25, R28, R32, R38, T38, T45, T51 etc8. Shank ...