ALUMINUM, BRASS, CAST IRON, MILD STEEL, METAL, STAINLESS STEEL CUT MATERIAL; BI-METAL BLADE MATERIAL; 3/4 INCH DIAMETER; 690 RPM (ALUMINUM), 600 RPM (BRASS), 300 RPM (CAST IRON), 230 RPM (TOOL/STAINLESS STEEL), 460 RPM (MILD STEEL) SPEED RATING