Freud Mortise Compression Router Bit 77 604 3 8 Inch Solid Carbide Spiral (3 Flute 24000 Max RPM Double Sided Melamine Plywood Cabinet Joinery) Spade it delivers fast setup it delivers fast setup 65 Pounds Country of Origin USA with Global Materials Pro Tip: To significantly extend the lifespan of the bi metal cutting edges and prevent thermal degradation during heavy duty metal installations The Freud 77 604 3 8 Inch Three Flute Mortise Compression Spiral Router Bit delivers high density machining accuracy for processing double sided materials under 5 8 inch thickness forcing waste fibers downward into the cut core instead of pulling them upward