Freud 70-104 Router Bit, 1/4 in Dia Shank, Carbide | Creates key holes for hanging plaques and shelves. Large diameter bores holes to allow nail or screw heads to enter the slot while the smaller diameter allow room for the shank of the nail or screw. Cuts all composition materials, plywood, hard wood and soft wood. Use on CNC and other automatic routers as well as hand held table mounted portable routers.