New Reproduction Right Hand lug bolt is 1-7/16" total length. The bolt head is 16/16" hex head. The diameter of the threads is 1/2". The 13 is the number of threads per inch which makes this a coarse thread lug bolt. These were used on Dayton/Fayette hubs in the 1970s. These are a little different from the original ones but will work fine. These are special made and may have 1-2 week lead time.