Specification: Shank diameter: 1/4 inch Max cutting depth: 1/2 inch Cutting thick: 5/64", 3/32", 1/8", 5/32", 3/16", 1/4" Bearing Diameter: 7/8" Material: alloy steel Note: The slot router bit is NOT big enough to make a deep cut into the wood. The blade is thin and not suitable for cutting high hardness wood. The router bit must be fully inserted and tightened. Package Included: Slot Cutter Router Bit Set - 6 sizes