10 x Vintage 5/16" UNF x 3/4" long Hex Head HT Bolts. Grade S. These have been sat on a shelf for over 30 years. Please have a look at my photos as this will give you the best idea of what I am selling. If you need any more information please ask. If you want a buck lot of these please ask for a deal. I will combine any postage costs with other purchases.