CONSTANT PITCH TYPE; METAL, NON-METAL, FERROUS METAL CUT MATERIAL; BI-METAL BLADE MATERIAL; 1-3/8 INCH DIAMETER; 250 RPM (MILD STEEL), 125 RPM (STAINLESS STEEL), 165 RPM (CAST IRON), 330 RPM (BRASS), 375 RPM (ALUMINUM) SPEED RATING; V TEETH TYPE