Grizzly 3/4-Inch bore shaper cutters feature top-quality c-2 carbide--the best available for wood cutting applications. shaped and sharpened with diamond wheels as fine as 600 grit these outstanding cutters are constructed with a high-tensile silver-based brazing which offers the utmost in strength and durability. can be used on woods wood composites plywood and some plastics at 5 000 to 10 000 rpm. an excellent selection.