Premium C3 micro-grain tungsten carbide blades for a sharper longer lasting edge Solid Hardened Steel Bodies with Silver induction brazing for maximum strength and durability Designed for creating strong finger glue joints for straight or 90 degree corners for small boxes and crates. Adjust the finger joint router bit height to work on different board thicknesses from 7/16" up to 1-1/4", meet the high demands of woodworking. Used on CNC and other automatic table-mounted routers, cuts plywood, chipboard, MDF, solid surface, softwood and other wood composite materials. Specification: color: as show Material: Tungsten Carbide Shank Diameter: 1/4 Inch Overall Length: 3-3/16 Inch Cutting Diameter: 1-3/8 Inch Depth of Blade: 5/16 Inch Min Stock Thickness: 7/16 Inch Max Stock Thickness: 1-1/4 Inch Package Includes: 1 x Finger Glue Joint Router Bit