VARIABLE PITCH TYPE; STEAM OXIDE FINISH; FERROUS METAL, NON-FERROUS METAL, NON-METALLIC CUT MATERIAL; BI-METAL BLADE MATERIAL; 1 INCH DIAMETER; 350 RPM (MILD STEEL), 235 RPM (CAST IRON), 470 RPM (BRASS), 525 RPM (ALUMINUM) SPEED RATING