... 7° taper drill bitThread button bits1. Rope thread:R25 R28 R32, R33, R38, R35 T thread: T38, T45, T51, ST58, T60 GT 60 ... , T45-76MM, T45-89MM, T45-102MM, T-89MM, T51-102MM, T51-127 etc.3. Button bit face design: Flat face, drop centre ... : degree 4° ,6°, 7°, 9°,11°, 12°.2. Type: flat bit, cross bit, button bit3. Main bit diameter: 30mm, 32mm, 36mm, 40mm 4.Package: in ...