The u-bolt dimensions are listed below. Diameter: 3/8″ Inner Diameter: 2-1/2″ Length: 2-1/2″ Threads: 1-1/2″ Our eBay Store About Us Contact Us Add to Favorite Sellers Zinc Plated Square U-Bolt 3/8″ Thick x 2-1/2″ ID x 2-1/2″ Long w/ Zinc Plated Nuts 37.95 The u-bolt dimensions are listed below. Diameter: 3/8″ Inner Diameter: 2-1/2″ Length: 2-1/2″ Threads: 1-1/2″