A very simple tool that makes drill size identification very easy. Also measures other small items. Etched graduations. This is the imperial version, the metric version is available in our shop. Made from Tempered Stainless Steel. Identifies sizes; 1/16, 5/64, 3/32, 7/64, 1/8, 9/64, 5/32, 11/64, 3/16, 13/64, 7/32, 15/64, 1/4, 25/64, 3/8, 23/64, 11/32, 21/64, 5/16, 19/64, 9/32, 17/64, 13/32, 27/64, 7/16, 29/64, 15/32, 31/64, 1/2. (.062, .078, .093, .109, .125, .140, .156, .171, .187, .203, .218, .234, .250, .390, .375, .359, .343, .328, .312, .296, .281, .265, .408, .421, .437, .453, .468, .484, .500)