Description: 【 Material】: The blade of the tool set is made from tungsten steel, known for its high hardness, wear resistance, good strength, toughness, and heat resistance. The handle is made from 45# steel, offering high strength and resistance to deformation. 【Feature】: 6 piece router bit set provides more variety of T-slots or keyhole slots, the router bit set is suitable for solid wood, particleboard, MDF, plywood and more. 【 Welding】: The Keyhole Router Bit Set features a solid hardened steel body and anti recoil design. The blade is sharper and can be trimmed and polished for a very clean cut 【Product Dimensions】: 1/4 inch shank keyhole router bit set , 1/4, 5/16 , 3/8, 9/16, 1/2, 5/8 inch in blade diameter. for wood hex bolt T slotting milling cutter set. 【Package Includes】: The package contains a set of 6 tools, perfect for various woodworking tasks, including T-slot cutting, lock hole cutting, and picture frame hanging hole cutting. Specification: Material: Tungsten steel Size Chart: 4.6cmx0.635cm/1.81inchx0.25inch 4.6cmx0.794cm/1.81inchx0.31inch 4.6cmx0.952cm/1.81inchx0.37inch 4.6cmx1.27cm/1.81inchx0.50inch 4.6cmx1.43cm/1.81inchx0.56inch 4.25cmx1.59cm/1.67inchx0.63inch Package Includes: 6 Pieces Shank Router Bits Note: Please allow slightly errors due to manual measurement and different monitors.