... , R32, R35, R38, T38, T45, T51, ST58, T60Button bit face design: Flat face, drop centre, Normal and Retrac body ... and Conical. (Threaded R32, R38, T38, T45, T51, bit diameter: 45mm-127mm);(2) Main button bits diameters:R32-45mm ... as client's requirement.(4)Productivity: 10000pcs/ monthBased in China, Maxdrill Rock Tools Co Ltd is an ISO 9001 ... upon your demand. MAXDRILL tunnelling drilling button bit