Vermont American 23110 1/2-by-1/2-Inch Carbide Tipped Hinge Mortise Router Bit, 2-Flute 1/4-Inch Shank Razor sharp cutting edge diamond honed for smooth cuts Triple tempered shank for maximum durability Industrial micrograin carbide for smooth cut For mortise making when work is started at edge Good chip clearance makes bit ideal for gummy wood