3 Pieces 1-4 inches Shank 6.35mm T Slot Cutter Router Bits Set Key Hole Bits Milling Cutter Kit Woodworking ToolsFeatures: Create t slots for custom jigs and hold downs or for picture frame keyhole hanging. Suitable for cutting a t groove for wall hanging things. Cuts density board, solid wood, MDF, particleboard, etc. Use on automatic routers as well as hand held and table mounted portable routers. Specification: Material: alloy Colour: green Size: 1 4", 3 8", 1 2" ,5 8" ,3 4" Package Contents: 1 x Woodworking Router Bit 5 16" 1 x Woodworking Router Bit 3 8" 1