The Grainger Approved Class ZZ Go Pin Gauge is a precision measuring instrument used to check the size of holes. It has a diameter of 0.3750 inches, a tolerance of +/- 0.0002 inches, and is made of hardened and ground tool steel. This pin gauge has a knurled grip, chamfered measuring surfaces, and meets Federal specification GGG-G-15C. It can be used to accurately measure the size of holes in metal, plastic, or other materials in manufacturing and inspection applications. The pin gauge is sold individually.