Flush trim router bit set, 1/4 inch shank,1 inch cutter depth, Cutting diameter 1/4" 1/2" 3/8" 5/16" 1/4 inch shank top bearing flush trim router bits are made of C3 Micro-grain tungsten carbide cutter with heat resistant Teflon coating for long life use Double straight flute type, clean and neat surface without glitches,Cutting sharp,smooth rotation, brisk operation Works great with all kinds of materials and surfaces, like woods, mdf, particle boards, plywood, panels, softwood, hardwood and many others Use on CNC and other automatic routers as well as hand-held and table-mounted portable routers Baorder 4PCS 1/4 Inch Shank Flush Trim Router Bit Set Top Bearing Bit Wood Milling Cutter Tool Features: Solid Hardened Steel Bodies with Anti-Kickback Design to control the depth of cut and work safely Body Material made of Solid Hardened 45# steel, Cutter Material made of Industrial grade micro grain YG8 carbide Alloy Double straight flute type, the main function is trimming, three-dimensional clearance angle, slotted Designed for the hand-held and table-mounted router and trimmer, it can not be used in electric drill drill machines Specification: Bit type: top bearing flush trim router bit set Shank diameter: 1/4 inch Cutting diameter: 1/4" 1/2" 3/8" 5/16" Router bit body material: solid hardened steel Router bit cutter material: 45# industrial grade micro grain carbide Package included: 4pcs flush trim router bits Warm Tips: 1,Please wear a protective device when use it 2,Please use it on the correct device 3,Please don't cut ferrous metal and non wood materials, such as steel, iron and sand