... bits Size: 3 7/8"--17" API&ISO9001:2008 Brand new MOQ:1 piece API 8 1/2" 5 ... Packing: Wooden CaseWe can supply rock bits,kingdream bit,smith bit,tricone bits, diamond bits,PDC bits,TCI ... bits and so on .Specification: diameter from 3-1/8” to 17”.There are different PDC (polycrystalline ... ) grades and shapes applied for rock formations as follows:1. Andesite, marble, metamorphic schist (For hard, low ...