... bit, retract button bit, thread button bit.With ISO certificate & quality control.Button bits with 6tips, 7tips, 8tips, we do them ... 34mm, 36mm, 38mm, 40mm, 42mm, 44mm and so on. With different degree taper) Tapered Rod (Rod 19mm, 22mm, 25mm; ... --89mm, T51--115mm, T51--127mmPlease feel free to contact with us for more detailed specifications or catalog.Thread384245485156647689102115127R25√√ R28 ...