... shoe bit, corelifter, corelifter case, core barrel assembly, inner tube head assembly, over shot, hoist plugs, drill rod, casing pipe etc. With ... synthetic diamond, and it is used to couple the drill bit with the core barrel. Its main function is to ream the ... one. It also acts as a stabilizer for drill bit. Reaming shells (with double pads or three pads) are suitable to use ...