... T45 rock drilling bitsThread button bits1. Rope thread:R25 R28 R32, R33, R38, R35 T thread: T38, T45, T51, ST58, T60 GT 60.2. Main button bits ... diameters: R32-45MM, R32-51, R32-64, R32-76, T38-64MM, T38-76MM, T38-89, T38-102MM, T45-76MM, T45-89MM, T45-102MM ... 4.Package: in wooden case or in carton.Tapered button bits are mainly used in mining,coaling,metaling and etc T45 rock drilling ...