... high strength high toughness carbide teeth,5. Hours in the rotary cone bit with the impact, crushing and shearing the ... Fist Petroleum Equipment Co., Ltd, who produce and export drill bits. We have a Export Department, which specialize in the ... ourselves including Drill bits, Drill Pipe, TCI tricone bits, PDC bits, PDC Diamond drill bits, roller rock bits, core bits, all size bits in oilfield, water ...