The sharp carbide tipped bit, solid hardened steel bodies,Industrial quality router bits with C3 micro-grain tungsten carbide. This Bowl router bit is specifically designed and manufactured for the high quality demanded by woodworking industrial applications. Bowl Router Bit tool set with anti-kickback design,for long-lasting performance. Build up with heat-resistant PTFE coating for accumulation can reduce resin accumulation, thereby achieving quick and easy cleaning. For Cutting Various Materials - Suitable for wood, MDF, chipboard, compact plywood panel; Please DON'T cut ferrous metals and other materials such as steel, iron, sand, etc. Specification: Material: Solid Hardened Steel with C3 micro-grain tungsten carbide. Size: Shank Diameter: 1/4'' Cutting Diameter: 1/2'', 3/4'', 1-1/8'' Overall Length: 2-3/8'', 2-1/4'', 2-1/2'' Package Included: 4 x BowlTray Router Bits Note: Please don't cutting ferrous metal and non wood materials, such as: steel, iron, sand, etc.