ALUMINUM, BRASS, CAST IRON, MILD STEEL, METAL, STAINLESS STEEL CUT MATERIAL; BI-METAL BLADE MATERIAL; 1-3/4 INCH DIAMETER; 295 RPM (ALUMINUM), 250 RPM (BRASS), 130 RPM (CAST IRON), 95 RPM (TOOL/STAINLESS STEEL), 195 RPM (MILD STEEL) SPEED RATING