... water well, oil field 3)4.1/2''~26'' New design PDC bits, good performance 4.1/2", 4.3/4", 5 ... .1/8", 5.5/8", 5.7/8", 6.1/4 ... bits are avaiable. Our current product list as below: 1. Impregnated diamond core bits 2. Surface set Diamond Bits( ... . Casing(Rod) shoes/Casing bits 4. Reaming shells 5. PDC bits (coring or non-coring) 6. Core lifters, core ...