Hillman Hardware Essentials 320900 Bolt Square Saddle Zinc (3/8"-16 x 5" x 4") Square U-bolts are great for attachment to square shaped posts. . Includes hex nuts and plate. Measurements are as follows: diameter x inside length x inside width. Features Square U-bolts are great for attachment to square shaped posts Includes hex nuts and plate Includes hex nuts and plate Includes hex nuts and plate Fast and Free Shipping You're already purchasing the item. Why pay additional for shipping, especially slow shipping? We get your order shipped out within 1-business day and delivered to your doorstep as quickly as possible. Competitive Pricing With our dynamic pricing model, our prices are always competitive. Our prices are some of the lowest that you will find on the internet. Rest assured that you're getting a good deal when purchasing with us. 30-day Money Back Guarantee We are committed to making sure that you leave this transaction satisfied. If you're unhappy with the product for any reason, you may return it back for your money-back or a replacement within 30 days. No questions asked!