Vermont American 22130 1/4-Inch HSS Dovetail Router Bit Razor sharp cutting edges are diamond honed for satin smooth cuts Radial Relief eliminates friction and chatter Optimized hook and shear angles for faster chip clearance and quicker feed rates Truest running shanks with concentricity of + .000"/-.001" T.I.R. (total indicator runout) Ball bearing guides on selected edging and trimming bits prevent burning and marring