This two-bit set make it a breeze to create your own traditional sash windows. The bits come in a wooden box to keep them together for when you need them. SPECIFICATIONS Cutting Diameter: 1-1/2" Cutting Length: 5/8" Large Radius: 1/4" Overall Length: 2-3/8" Shank Diameter: 1/2" Cutting Diameter: 1-3/8" Cutting Length: 1-3/8" Large Radius: 1/4" Overall Length: 3-9/16" Shank Diameter: 1/2" Craftex Blue Tornado bits are CNC machined to have perfect balance and leave a smooth finish. All bits are manufactured from 4140 & 5140 steel and are put through a special heat treatment process to ensure proper hardness and tensile strength to prevent bending or breaking. Tungsten micro-grain C3 carbide gives the cutter long-lasting strength that can be sharpened many times over. Craftex Blue Tornado bits have an anti-kickback design along with a non-stick coating for easy pitch removal. Finished with an automotive semi-transparent finish, to give a long-lasting shine. All Craftex Blue Tornado router bits and shaper cutters are backed by a limited, life-time warranty.