VARIABLE PITCH TYPE; STEAM OXIDE FINISH; FERROUS METAL, NON-FERROUS METAL, NON-METALLIC CUT MATERIAL; BI-METAL BLADE MATERIAL; 1-7/16 INCH DIAMETER; 240 RPM (MILD STEEL), 160 RPM (CAST IRON), 315 RPM (BRASS), 360 RPM (ALUMINUM) SPEED RATING