... -Set Diamond Bits are set with a singular layer of natural or synthetic diamond utilizing a hard matrix compound ... design ensures sufficient overlap to prevent premature wear of the matrix.1,Surface-Set diamond bits are ... UWF, ZWFWT SeriesRWT,EWT,AWT,BWT,NWT,HWT(Single Tube/Double Tube)WG SeriesEWG,AWG,BWG,NWG,HWG ... (Single Tube/Double Tube)WM SeriesEWM,AWM,BWM,NWMT2 ...