... on time Type6"(152mm), 6 1/2"(165mm), 8 1/2"(215.9mm), 9 1/2"(241.3mm), 12 1/4"(311mm) , 13 5/ ... 346mm) , 14 5/8"(371mm), 15"(381mm), 17 1/2"(445mm), 24"(609mm), 26"(660mm)IADC 147,437,447, ... (extra features)Button bit,saw teeth1) Y-Conical teeth 2) X-chisel teeth3)K- wide teeth4)G- Gague ... durability.637Hard Formation TCI Tricone BitsThe 637 bits can be used to drill hard and abrasive formation. Wear- ...