... Rock Roller Bits: 7 7/8 to 14 1/2 ModelTCI BIT, STEEL TOOTH BITIADC CODE 116 117 ... 516 536 535available sizes:From 2 7/8 to 26”larger sizes for hole opener bit ,reamer bitadvantagemost ... formationButton size (extra features)Button bit,saw teeth1) Y-Conical teeth 2) X-chisel teeth3)K- wide teeth4 ... drill bit ,diamond core bit,bicenter bit,single cone bit , reamer bit,down hole opener,hole enlarger,drag bit ...