Mountain 7430 10-Piece Sheet Metal Hole Cutter Kit Cut thru sheet metal, plate, and plastic up to 1/4" thick. Precision ground M2 High Speed Steel 3 times faster than hold saws or twist drills Seven convenient sizes: 5/16", 3/8", 7/16", 1/2", 9/16', 5/8", 3/4" plus arbor, 2 pilots, adjusting wrench, and center punch Packaged in a sturdy plastic case