Vermont American 23117 3/8-by-1/2-Inch Carbide Tipped Rabbet Router Bit, 1/2-Inch Ball Bearing 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 Equipped with pilot for making rabbeting cuts without a router guide 38-Inch rabbet width