This ad is a set of 20 vintage automotive OEM fasteners, specifically designed for the chassis of a vehicle from around the mid 1960's to late 1970's. There are 12ea SAE grade 5 fasteners which are UNC 5/16" X 18 TPI, 9ea which have a captured large flat washer, and 3ea which have flange heads. There are 7ea UNC 5/16" X 18 that are grade 8, and all are identical with flanged heads. There is 1ea UNC 1/4" X 20 TPI that is 1 inch long and has a large flat captured washer. They are branded with an "L" in the circle or only a circle 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.