I love woodworking and a router is an essential tool for many complex and simple woodworking tasks. Properly sharpened high speed cutters with tungsten carbide (TC) inserts on the edges are needed to keep them sharp when cutting wood, chipboard or MDF. TC Slot Milling Bits for fancy Ogee Rail & Stile work. Bits are guided by a guide bearing and shown in 3 pictures. See listing for exact dimensions and better bit profiles. The seller puts both in a plastic box (page 4) which seemed like a bad idea to me. A length of plastic tubing will not help prevent damage from the burrs hitting each other. TC is strong and wears slowly, but can be brittle. I won't keep her like this. I recommend this Flytuo brand Ogee rail and stile bit set, 1/2" shank, 2 woodworking cabinet door bits, wood carbide slot cutter (3/8" depth of cut, up to 1" stock). Unusual parts, poor packaging I hope you found the information and my review helpful.