... used to couple the drill bit with the core barrel. Its main function is to ream the ... specific diameter which ensures adequate clearance for the core barrel and sufficient clearance for the new bit ... covered no matter what your requirements are. Size Available: "Q" Series: AQ, BQ, NQ, HQ, PQ (Front end & ... AWT, BWT, NWT, HWT (Single Tube/Double Tube) WG Series: EWG, AWG, BWG, NWG, HWG (Single Tube/Double ...