These are part of a small batch of 25 custom square u bolts we supplied to a power laboratory. Type 304 stainless steel material was used and 3/8-16 thread was incorporated at approximately 3 inches in length on each leg. The inside width was 4 inches and inside depth at 10 inches. The parts were completed and shipped within 5 days of order confirmation, with material certs per our customer's specifications.