We supply surface set reaming shell, TC reaming shell, impregnated reaming shell, adaptor reaming shell, backend reaming shell. Reaming shell is set with natural or synthetic diamond ... acts as a stabilizer for drill bit.Size Available:"Q" Series: AQ,BQ,NQ,HQ,PQ (Front end & Back end Type ... ,EWT,AWT,BWT,NWT,HWT (Single Tube/Double Tube)WG Series: EWG,AWG,BWG,NWG,HWG (Single Tube/Double Tube)WM ...