This ad is an assortment of 10 vintage used automotive OEM fasteners, specifically designed for the chassis of a vehicle from around the mid 1960's to late 1970's. There are 7ea SAE grade 5 fasteners which are UNC 5/16" X 18 TPI, and 3ea that are UNC 3/8" X 16. One of those is 1 1/8 inch long with a flanged head. The other 2 have standard hex heads and require a 9/16-inch wrench and are 1 1/4 inches in length. The 5/16" fasteners consist of 3ea that have a captured lock washer, 2 which are 1 inch long, and 1 is 1 1/4 inches in length. There are 3ea of the 5/16 " fasteners have flanged heads, the 2 are 1 1/8 inch long and the other is 1/2 inch long and a standard 5/16" by 1 inch long. They have several different brands and were made in the United States. These fasteners are not modified and come with a free return warranty. Although they are designed for a specific chassis, they are a rare find for collectors and enthusiasts and will also work for fixes that are not as extensive or technical as automotive repair.