The router bit set includes 1 tongue and groove cutter, 1 groove cutter and 1 4-finger joint cutter. Bit size: All cutters have a shank of 6 mm; the tooth width of the T-shaped tongue and groove cutter is 6.35 mm, the depth is 12.7 mm; the tooth width of the finger joint cutter is 3.17 mm, the depth is 7.96 mm. High quality material: Made with a solid hardened steel body and industrial-grade micro-grain carbide cutters for a sharper and longer lasting cutting edge, the clever anti-kickback design ensures safe installation. High hook and shear angle allow the cutters to cut smoothly into the material and produce clean, splinter-free results. Feature of the cutter: The tongue and groove cutter set works great with all types of materials and surfaces such as wood, MDF, chipboard, plywood, board, softwood and hardwood. The finger joint features a double-edged design, carbide teeth and four removable cutters so you can make joints in a wide range of material thicknesses. Application: These