... and low price 4.Reliable bearing Model TCI Bit, Steel tooth bit IADC CODE114 117 127 216 217 226 226 ... 7/8 to 26”larger sizes for hole opener bit ,reamer bitadvantagemost favourable price and best qualtitybearing type: ... hard,very hard formation Button size (extra features)Button bit,saw teeth1) Y-Conical teeth 2) X-chisel ... , geothermal, directional boring, and underground foundation work drill rock bit