... R25, R28, R32, R35, R38, T38, T45, T51, ST58, T60 Button bit face design: Flat face, drop centre, Normal and Retrac body ... . (Threaded R32, R38, T38, T45, T51, bit diameter: 45mm-127mm);(2) Main button bits diameters: R32-45mm, R32-51, R32-64 ... 2008-certified manufacturer of high quality, competitively-priced rock drilling tools, as well as self-drilling rock bolts and accessories. Thanks to our highly ...