[MATERIAL]: Our cutters are made of solid hardened steel and C3 grit carbide. (C3 grade carbide is the highest grade used in the router bit industry). Precise product design creates smooth, detailed cuts suitable for all levels of complexity [PERFECT DESIGN]: Hardened steel body with anti-kickback design. Balance tolerance of +/- 0.003" (allowing smooth operation at very high rpm). 3 C3 Carbide Tip - Micro-grain grade provides maximum strength and durability.[WIDE USE]: Router bit tools can cut most materials including: wood, MDF, particle board, plywood, panel, softwood, hardwood, etc. Suitable for handcrafting drawer or other woodworking, can be used to join wood from edge to edge or end to end. Perfect choice of professionals and hobbyists.[Where to use]：Designed for laptop or desktop wood engraving machines, such as portable and table-mounted CNC routers. Note: It can not be used in drills and electric drills Note: The data is all manual measurement, please allow 1 - 44cm error, due to the difference of light and d display, there will be a certain color difference, depending on the physical object received.