... history Milled Tooth Rock Roller Bits: 7 7/8 to 14 1/2 ModelTCI BIT, STEEL TOOTH BITIADC CODE 116 117 12 6127 ... bits,rotary bit, TCI tricone bit,PDC drill bit ,diamond core bit,bicenter bit,single cone bit , reamer bit,down hole opener,hole enlarger,drag bit,button bit and ... .63 3/4-6 7/8294-53980-40Contact information TCI Bit 165 mm with 3 1/2" REG Pin for Hard Rock