The Porter-Cable 43767PC is a 1/4 inch Double Roman Ogee Router Bit. The Porter-Cable Professional Edge router bit is constructed of 4140 Alloy Steel, a harder grade of steel than standard cast steel bit bodies. Each bit is annealed and heat treated to Rockwell hardness of 40-45 harder than is possible with cast steel bodies. The bit is precisely ground using computer controlled machining for precision tolerances and perfectly concentric shafts. The carbide tip is made from specially blended micro grain carbide for superior results and long lasting sharpness. A black oxide coating protects the bit against corrosion while preventing resin build up and improving chip clearance. The 43767PC Bit is designed for forming decorative edges on projects such as molding, furniture and shelving.