... 35mm, 45mm to 89mm, 102mm and so different degree Thread for example: R22, R25, R28, R32, R38, ... T45, T51 etc.) Retrac Button bits with different Thread different diameters. 2. Dth bits: From 115mm, ... 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, T38 ...