... many years. Including of tapered button bit, retract button bit, thread button bit. With ISO certificate & quality control. Button bits with 6tips, 7tips, 8tips ... rod. 19mm, 22mm; Shank hex. 19mm, 22mm) B. Thread Button BitThread button bit (33mm, 35mm, 45mm, 51mm, 57mm, 64mm, 70mm, ... , T38mm--102mmT45; T45--89mm, T45--102mmT51; T51--89mm, T51--115mm, T51--127mm Please feel free to contact with us for ...