The Grainger Approved Gage Pin Set ZZ Minus is a set of precision ground gage pins for calibrating gages, checking hole locations, and setting up inspection equipment. The set includes 17 pins ranging from 0.4995" to 1.0005" in diameter, with a tolerance of +/- 0.00005". The pins are made from hardened and ground alloy steel for durability and accuracy. They come in a fitted plastic case for storage and portability. This gage pin set provides a wide range of pin sizes for various precision measurement applications.