MAXDRILL button bits (1)Thread: R22, R25, R28, R32, R38, T38, T45 ,T51,ST58, GT60 (2)Diameter: 38-127mm. (4)Package: in wooden case or in carton. (5)Productivity: 30000pcs/ month Especillay our ST58, GT60 Button Bit Retrac Bit, which is widely welcomed by our client with good quality and good price .