Item Type: Keyhole Router Bit Set Material: Carbon steel + alloy Purpose: T slot keyhole milling cutter Color: Silver + black Tool Handle Diameter: 1/2in Blade Size: 5/16in, 3/8in, 1/2in Package List 3 x Keyhole Router Bit 3 x Storage Box Please wear protective gear when using to prevent the sawdust from splashing and hurting yourself. 1Curve Design: Good quality alloy blades are more of sharpness and durable. The head adopt a curved curve design, which is conducive to shredding and more efficient perforation 2For Various Materials: Keyhole router bit is suitable for solid wood, particle board, medium density fiberboard, plywood, etc. 3Beautiful And Clean Cut: T slot cutter use the smallest refinish paint to polish to create a very beautiful and clean cut 4Good Quality Carbon Steel: The handle is made of good quality carbon steel, strong in hardness and very durable 51/2in Shank Diameter: Shank diameter is 1/2in, blade size contain 5/16in, 3/8in, 1/2in, convenient for you to use