CEMENT BOARD, CERAMIC TILE, FIBERGLASS, CAST IRON, WOOD CUT MATERIAL; CARBIDE TIPPED BLADE MATERIAL; 3-1/2 INCH DIAMETER; 380 RPM (FIBERGLASS), 165 RPM (PHENOLIC) SPEED RATING; 1-5/8 INCH CUTTING DEPTH; YES SUPPLIED WITH ARBOR; STRAIGHT ARBOR SHANK TYPE