CONSTANT PITCH TYPE; METAL, NON-METAL, FERROUS METAL CUT MATERIAL; BI-METAL BLADE MATERIAL; 3-1/8 INCH DIAMETER; 110 RPM (MILD STEEL), 55 RPM (STAINLESS STEEL), 70 RPM (CAST IRON), 140 RPM (BRASS), 165 RPM (ALUMINUM) SPEED RATING; V TEETH TYPE