The MatchFit 1/4in Relief Router Bit is specifically designed to remove 55% of waste material prior to routing dovetail grooves with your MatchFit Dovetail Router Bit. Starting with a relief groove prevents tearout and clogging which improves the cut quality of dovetail grooves, and prolongs the lifespan of your MatchFit Dovetail Router Bit. Features Tearout-free 1/4inrelief groove Cleaner cuts and longer lifespan of you MatchFit Dovetail Router Bit 11/32in laser cut depth guide Router collet safety line prevents bit from bottoming out 1/16intop radius 3 degree carbide upshear