CONSTANT PITCH TYPE; METAL, NON-METAL, FERROUS METAL CUT MATERIAL; BI-METAL BLADE MATERIAL; 4-1/2 INCH DIAMETER; 75 RPM (MILD STEEL), 35 RPM (STAINLESS STEEL), 50 RPM (CAST IRON), 100 RPM (BRASS), 105 RPM (ALUMINUM) SPEED RATING; V TEETH TYPE