Item Type: Round Nose Router Bit Kit Material: Cemented Carbide Specification: 8 x 6mm / 0.31 x 0.24in 8 x 8mm / 0.31 x 0.31in 8 x 10mm / 0.31 x 0.39in 8 x 12mm / 0.31 x 0.47in 8 x 14mm / 0.31 x 0.55in 8 x 16mm / 0.31 x 0.63in 8 x 18mm / 0.31 x 0.71in 8 x 20mm / 0.31 x 0.79in 8 x 22mm / 0.31 x 0.87in 8 x 25mm / 0.31 x 0.98in 8 x 32mm / 0.31 x 1.26in Package List 11 x Round Nose Router Bit 11 x Storage Box 1CEMENTED CARBIDE MATERIAL: Made of premium cemented carbide material, these router bits are strong and sturdy, wear resistant and has long service life. 2APPLICABLE MATERIAL: This router bit kit is suitable for wood, medium density fiberboard, particle board and dense plywood; Please avoid cutting black metal and other materials such as steel, iron, sand, etc. 3WIDE APPLICATION: You can use these bits to make kitchen and bathroom doors, office cabinets, floor tables, bedroom shelves, etc. 411PCS: There are 11 pieces router bits in the package in different specifications that you can use them to meet different needs. 5EASY CARRYING: These router bits are light weight and are individually packed that you can easily carry them for convenient use.