CONSTANT PITCH TYPE; CEMENT BOARD, CERAMIC TILES, FIBERGLASS, CAST IRON, WOOD CUT MATERIAL; CARBIDE TIPPED BLADE MATERIAL; 4 INCH DIAMETER; 330 RPM (FIBERGLASS), 145 RPM (PHENOLIC) SPEED RATING; 1-5/8 INCH CUTTING DEPTH; NO SUPPLIED WITH PILOT DRILL