... & competitive price 4- All model & dimension available 5-High speed Steel tooth Tricone drill bit Hejian Fist Petroleum Equipment Co., Ltd. We ... ,124,126,134,136,137)These bits are designed to drill formations such as shales, medium soft limestone, Medium sandstone and ... formations(213,214,215,217)These bits are designed to drill formations such as hard sandstone, dolomite, and broken formations with ...