taper button bit 1. Manufacturer of varies button bit 2. Retrac button bit, tapered button bit etc 3. High efficiency, long Specialisted ... . Including of tapered button bit, retract button bit, thread button bit.With ISO certificate & quality control.Button bits with 6tips, ... requirement. We can manufacture the following types: A. Taper button bitTapered button bit(28mm, 30mm, 32mm, 33mm, 34mm, 36mm, ...