Product Info Catalog Tools Power Drill, Bits & Accessories 25/64-Inch Carbide Keyhole Router Bit 25/64-Inch Carbide Keyhole Router Bit Request a Quote UPC: 08925381327 SKU: 772780 Model Number: 70-104 25/64" diameter, carbide keyhole router bit. 1/4" shank, 7/16" cutting length, 1-5/8" total length. Application: key holes for hanging plaques and shelves Solution: large dia end bores holes to allow nail or screw head to enter slot small diameter allows room for the shank of the nail or screw to enter Cuts all composition materials, plywood, hardwoods, softwoods Use on CNC and other automatic routers, hand-held or table-mounted routers