[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 skill levels. [PERFECT DESIGN]: Hardened steel body with anti-kickback design. Balance tolerance of +/- 0.003" (allowing smooth operation at very high RPMs). 3 C3 Carbide Tip - Micro-Grain grade provides maximum strength and durability. [ WIDE USE]: The router bit tools can cut most materials, including: wood, MDF, particleboard, plywood, panel, softwood, hardwood, etc. Suitable for handcrafted drawer or other woodworking, can be used to join wood from edge to edge or end to end.Perfect choice of professionals and amateurs. [Where to use]Designed for laptop or desktop wood engraving machines, such as portable and table-mounted CNC routers Note: It cannot be used in drills and electric drills.