Infinity Tools 83-033, Plywood Panel Door Kit For Use With Infinity Rail & Stile Shaper Cutters Part #83-030, 83-031 & 83-034, 3/4 Bore Precision machined from fatigue-proof steel for extra strength 3-wing micro-grain carbide tips for a long life and repeated sharpening Silver PTFE coating reduces resin build-up for fast and easy cleaning 1/2" depth of cut