VARIABLE PITCH TYPE; STEAM OXIDE FINISH; FERROUS METAL, NON-FERROUS METAL, NON-METALLIC CUT MATERIAL; BI-METAL BLADE MATERIAL; 1-5/8 INCH DIAMETER; 210 RPM (MILD STEEL), 140 RPM (CAST IRON), 280 RPM (BRASS), 315 RPM (ALUMINUM) SPEED RATING