Class ZZ Steel Pin Gage Set minus 250PCS (0.251-0.500) M2. [Size]: 0.251-0.500″ range, minus tolerance of 0.0002″, length of 2″ ±0.01″, step size of 0.001, HRC 60-62. [Features]: Made of bearing steel. Each gauge is heat-treated, polished, and burr-free for precision and durability. [Product Includes]: 250pcs pin gauges in a plastic case. [Clear Marking]: The case is marked with each specification size for easy identification and organization. [Application]: Used for detecting hole diameters and distances, and for calibration of measuring equipment. 18 x 12.4 x 2.75 inches; 21.61 Pounds. 250PCS (0.251-0.500) M2. Product Dimensions: 12.4 inches x 18.0 inches x 2.75 inches. Weight: 21.61 lb. We reserve the right to cancel any order for any reason at any time. We are not responsible for undeliverable addresses. Your satisfaction is guaranteed! All of our items, unless otherwise stated, will only run on 120 volts. Please check to make sure your country complies with these specifications. We will work with you to resolve any problem you may have.