Freud 1 2 Inch Shank Adjustable Entry and Interior Door Router Bit System (99 267) Table Saws Protective Nanocoating: Industrial Cooling Element Protective Nanocoating: Industrial Cooling Element coating reduces frictional heat these heavy duty 2 pack cutter blades feature high grade M2 laminated high speed tool steel (HSS) to withstand extreme frictional heat and preserve razor sharpness across continuous milling passes 000 RPM Cutter Tip Metallurgy TiCo™ Hi Density Titanium Cobalt Carbide Required Equipment Type Table Mounted Router with Fence (1 2 in deep extended mortise and tenon frame joints for 1 3 8 inch interior doors and 1 3 4 inch exterior entry doors