VARIABLE PITCH TYPE; STEAM OXIDE FINISH; FERROUS METAL, NON-FERROUS METAL, NON-METALLIC CUT MATERIAL; BI-METAL BLADE MATERIAL; 1-1/8 INCH DIAMETER; 300 RPM (MILD STEEL), 200 RPM (CAST IRON), 400 RPM (BRASS), 450 RPM (ALUMINUM) SPEED RATING