... of high strength high toughness carbide teeth,5. Hours in the rotary cone bit with the impact, crushing and shearing the ... , medium and hard of various strata.7. Reasonable price and long working life.Size and types availableCommon sizes: 6, 6 1/ ... 2, 7 7/8, 9 7/8, 10 5/8, 12 ... 9 7/8" Kingdream HAS 447G TCI Tricone drill bit with best price