... 42mm, 44mm and so on with different degree taper) Thread Button Bits (33mm, 35mm, 45mm to 89mm ... T45, T51 etc.) Retrac Button bits with different Thread different diameters. 2. Dth bits: From 115mm, ... 7, 11, 12 degree taper) , Length can be according to customers requests. 5 Thread Drill RodR22, R25, R28 ... to customers requests. 7. Coupling with different thread for example R22, R25, R28, R32, R38 ...