The product is a pack of 10 9/16"-12 nylon insert hex lock nuts, made of grade 2 zinc plated steel. These nuts have 12 threads per inch and a fine thread style. The nuts are designed for external hex drive style and have a height of 0.656 inches. Manufactured in the United States by Stelfast Inc, these nuts offer a secure and durable fastening solution for various industrial and commercial applications.