New/Old Stock left hand lug bolt is 1 -9/16" long. The bolt head is 13/16" hex head. The diameter of the threads is 1/2". These lug bolts are no longer available and next to impossible to find. These were used on Dayton/Fayette hubs in the 1970s. Has some rust from just sitting around. Actual product may vary from photos but all are comparable.