... Set Diamond Bits are set with a singular layer of natural or synthetic diamond utilizing a hard matrix ... design ensures sufficient overlap to prevent premature wear of the matrix. Surface-Set diamond bits are primarily ... WT Series: RWT, EWT, AWT, BWT, NWT, HWT (Single Tube/Double Tube) WG Series: EWG, AWG, BWG, NWG, ... HWG (Single Tube/Double Tube) WM Series: EWM, AWM, BWM, ...