The Hillman Group 160508 50PC 1/2-13 CRS HEX NUT Product Description Heat-treated zinc. Coarse thread. Grade 5. From the Manufacturer Hex nuts are for general applications and are used with bolts and washers of the same finish. The most commonly used nut, they are often found in deck and fence building. The called out size is the inner diameter and the number of threads per inch or thread pitch. Features Heat-Treated Zinc. Coarse Thread. Grade 5 Country Of Origin: Taiwan, Province Of China From The Brand Name: The Hillman Group Model Number: 160508 USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.