... bit, reaming shells, casing bit, casing shoe bit, corelifter, corelifter case, core barrel assembly, inner tube head assembly, over shot, hoist ... plugs, drill rod, casing pipe etc. With ISO certificate & quality control. Surface-Set Diamond Bits are set with a singular layer of natural or ... which can't be cored. Crown are used A to set with synthetic, natural or polycrystalline diamond. It's used for ...