CONSTANT PITCH TYPE; METAL, NON-METAL, FERROUS METAL CUT MATERIAL; BI-METAL BLADE MATERIAL; 3-3/4 INCH DIAMETER; 90 RPM (MILD STEEL), 45 RPM (STAINLESS STEEL), 60 RPM (CAST IRON), 120 RPM (BRASS), 135 RPM (ALUMINUM) SPEED RATING; V TEETH TYPE