ALUMINUM, BRASS, CAST IRON, MILD STEEL, METAL, STAINLESS STEEL CUT MATERIAL; BI-METAL BLADE MATERIAL; 2-5/8 INCH DIAMETER; 195 RPM (ALUMINUM), 170 RPM (BRASS), 85 RPM (CAST IRON), 65 RPM (TOOL/STAINLESS STEEL), 130 RPM (MILD STEEL) SPEED RATING