This is a handy 35-pack of heavy-duty carriage bolts. Each bolt is 6 inches long with a 3/8-16 thread (that's the diameter and threads per inch). They have the classic rounded, domed carriage head with a square section underneath to keep them from spinning when you tighten the nut. Made from steel with a galvanized finish, which gives them good rust resistance for outdoor or damp projects. They meet Grade A307 and ASTM A307 specifications, so they're strong enough for general construction, fencing, woodworking, or trailer repairs. The brand is Lexar Industrial, part number 361148253463. Sold as a pack of 35, brand new in retail packaging. Super convenient if you need a bunch of the same bolt – no more running to the store mid-project. Just grab your wrench and go.