This carbide tipped router bit is specifically designed and manufactured for the high quality demanded by woodworking industrial applications. The cutting edges of this router bit are made from high industrial grade micrograin carbide tips brazed onto a heat-treated carbon steel body thus leading to exceptional hardness and rigidity. All reversible stile and rail bits come with a complete arbor assembly ( either 1/2" or 1/4" shank) , a profile cutter and one 1/4" x 3/8" deep slot cutters. These bits can be used to make both stile and rail cuts. In order to make glass doors of up to 1-1/8" stock, just stack one additional straight cutter next to the other.