... ,Tricone bit,rock bit,three tooth triconebit 2.certified by ISO,API 3.wide size code ... bits,and PDC bits. Bits sizes range from 3 7/8” to 26”.and cover almost all IADC codes. ... -strength, high flexibility, high temperature, high wear resistance.2. High-precision metal seal.3. Locking roller ball, ... soft, medium and hard of various strata.7. Reasonable price and long working life. 9 7/8" tci tricone bit