CONSTANT PITCH TYPE; CEMENT BOARD, CERAMIC TILES, FIBERGLASS, CAST IRON, WOOD CUT MATERIAL; CARBIDE TIPPED BLADE MATERIAL; 2-1/8 INCH DIAMETER; 630 RPM (FIBERGLASS), 270 RPM (PHENOLIC) SPEED RATING; 1-5/8 INCH CUTTING DEPTH; NO SUPPLIED WITH PILOT DRILL