You are buying fifty (50) NEW fasteners. They are 10-24 zinc plated steel moulding clip nuts with "mastic sealer" that are used on Ford, Edsel, Lincoln, Mercury and Willys vehicles. These nuts are for a 10-24 threaded stud. They have a 3/8" hex and have a 1/2" flange diameter. 
 

Please note that these nuts are NOT for any specific applications and may not be for some of the compatibility applications listed as we do not have all the body codes. Please compare your application to the photos and the sizes that we have provided.