We supplied these custom coarse thread 1/2 X 20-15/16 round U-bolts to a customer at 140 pieces with a lead time of approximately 2 weeks. ASTM A36 material was used and material and plating certs were made available to the customer with the parts. 3 inches of thread was incorporated on each leg and the inside depth was 8-3/4 inches. Inside width was requested at 4-9/16 inches.