Product Description: Hakkin 8pcs Keyhole Router Bit Set is a common keyhole slot cutter bit. Which is specifically designed for clean keyhole slot or slot for hanging Shape: 8pcs 1/4 inch shank keyhole router bit set (Green), 5/16 , 3/8, 1/2, 5/8, 9/16 inch in blade diameter. The handle is made of high quality carbon steel material, strong hardness and very durable. High quality alloy blade, make blade more sharp and durable, it head adopt arc curve design, beneficial to chip removal, perforation is more efficient. Multi-purpose: Cut long T slots as well as to make keyhole slots for hanging purposes, picture frames, shelves, mirrors, cabinets, support fixtures and other wall hangings etc. Keyhole Router Bit Set for solid wood, particle board, medium density fiberboard, plywood, etc. It can cut neatly and reduce sanding.