CONSTANT PITCH TYPE; METAL, NON-METAL, FERROUS METAL CUT MATERIAL; BI-METAL BLADE MATERIAL; 1-1/4 INCH DIAMETER; 275 RPM (MILD STEEL), 140 RPM (STAINLESS STEEL), 180 RPM (CAST IRON), 360 RPM (BRASS), 410 RPM (ALUMINUM) SPEED RATING; V TEETH TYPE