CONSTANT PITCH TYPE; METAL, NON-METAL, FERROUS METAL CUT MATERIAL; BI-METAL BLADE MATERIAL; 4-1/4 INCH DIAMETER; 80 RPM (MILD STEEL), 40 RPM (STAINLESS STEEL), 55 RPM (CAST IRON), 110 RPM (BRASS), 120 RPM (ALUMINUM) SPEED RATING; V TEETH TYPE