... ,ST68,GT60 Diameter 34mm-127mm Button bit shape Ballistic and Spherical Face shape Drop-center shape and Flat shape Company Information Brand ... , America, Middle East, East Asia, and South Asia etc. Main Products: 2.Threaded button bits (R25,R28,R32,R38, T38,T45 ... ,ST58,GT60) 3.Tapered drilling bits (tapered button bits, tapered chisel bits and tapered drill bits) Production Process Our Exhibition Our ...