[INTRODUCTION] : Reversible Finger Glue Seal Router Bit, shank diameter: 1/4inch (6.35mm)]. Industrial grade router bits with high welding quality, stable quality, high efficiency. Provide more convenience for your daily woodworking. Cut in a smooth tooth width which produces clean, crack free. [MATERIALS]: Our cutters are made of solid hardened steel and C3 particle carbide. (Grade C3 cemented carbide is the highest grade used in the milling cutter industry.) Precise product design creates smooth, detailed cuts for any level of sophistication. [PERFECT DESIGN]: Heavy duty hardened steel body with anti backlash design. Balance/- .003inch Tolerance (allows smooth operation at high speeds), C3 carbide tip - Particle grade provides increased strength and maximum strength. [WIDE USE]: The router bit tool can cut most materials including: wood, MDF, particle board, plywood, panel, cork, hardwood, etc. Suitable for handcrafted drawers or other joiners, for edge-to-edge or butt-to-edge wood joints. Perfect for professionals and amateurs to choose. [OBJECTS OF USE]: Designed for laptop or desktop wood engraving machines, such as portable and portable routers. Note: It cannot be used on drills and power drills.