The Large Diameter, Bolt & Washer Gauge measure inch & metric nuts, bolts, studs & washers from 3/4" & 16mm up to 2" & 50mm. This gauge is made of sturdy plastic and is water, alcohol, oil & grease resistant. It is a very informative, but compact and is a user friendly reference tool. Custom color match for orders 2500 pieces or more. 4" W x 11" L x 1/16" Thick