1,Tricone bit,rock bit,three ... HeJian Rui Da Petroleum Materials Co.Ltd. , with the convenient transportation, developed economy and superior geographical ... our consistent efforts.Tricone bit1.High-strength, high flexibility, high temperature, high wear resistance.2. High-precision metal seal.3. ... high-speed.4. The use of high strength high toughness carbide teeth,5. Hours in the rotary cone bit with ...