ALUMINUM, BRASS, CAST IRON, MILD STEEL, METAL, STAINLESS STEEL CUT MATERIAL; BI-METAL BLADE MATERIAL; 7/8 INCH DIAMETER; 585 RPM (ALUMINUM), 520 RPM (BRASS), 260 RPM (CAST IRON), 195 RPM (TOOL/STAINLESS STEEL), 390 RPM (MILD STEEL) SPEED RATING