... and competitive price 2). many years experience in well drilling equipments Available sizes:4 5/8"(118mm), 5 7/ ... 617,637,737IADC CODE116,117,126,127,136,137,216,217,316,317,346,347RPM(r/min)140~ ... can receive high WOB in the conventional drilling. It is suitable for various formations by matching cutting structure with ... exposure height. 17 1/2" milled tooth tricone bits for well drilling mine drilling