These eye bolts are heavy duty, with shoulder. Eye bolts are fully threaded with standard "unc" thread. Rod is threaded and welded into precision cast eye nuts. One nut and washer are included. Products are made of drop forged carbon steel.Hot Dipped Galvanized Finish.Standard dimension .5/8"-11steel eye bolts have a threaded shank with a ring for a head. This ring is used to hold a hanging fitting or a load, commonly seen in industrial rigging applications. In a shoulder pattern Eye Bolt, there is a shoulder between the shank and the eye. Shoulder pattern variety features a shoulder between the ring and the shank.