... bit ISO9001 &14001 high quality and the lower price OEM or produce according to your request best service ... , T51-102MM, T51-127 etc.3. Button bit face design: Flat face, drop centre, Normal ... Conical. (Threaded R32, R38, T38, T45, T51, bit diameter: 45mm-127mm);Tapered Button Bit1. Taper: degree 4° ... °, 9°,11°, 12°.2. Type: flat bit, cross bit, button bit3. Main bit diameter: 30mm, 32mm, 36mm, 40mm 4. ...