... fields,mining,hydrology,subterranean heatpilling,water well drilling and oil well drilling.This type of bits have optimal bearing design, it ... cone and the gauge make a good wear resistance largely extend the working life of bits.It is suitable for ... Drill bits, Drill Pipe, TCI tricone bits, PDC bits, PDC Diamond drill bits, roller rock bits,core bits,all size bits in oilfield,water well drilling, ...