These are the more unusual u bolts we have supplied over the years - they are custom fully threaded u bolts.  Typically only a partial length of each leg is threaded, whether cut threads or rolled, but in this case our customer specifically requested a fully threaded version.  1,000 pieces were run through a domestic production process with a lead time of 3-4 weeks.  4-40 thread was incorporated with the inside width at .57 inches and inside length at .75 inches.