... , 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, 120mm ... , Length can be according to customers requests. 5 Thread Drill RodR22, R25, R28, R32, R38, T38 ... according to customers requests. 7. Coupling with different thread for example R22, R25, R28, R32, R38, ...