U-Bolts for Round Posts are used to secure the arms of the Existing Fence Conversion System to round fence posts which are most commonly found on chain link fencing. The U-Bolts come in pairs of two with four washers and nuts. One set will attach one arm to a round post (so if you are attaching an entire Existing Fence Conversion System to chain link you will need 12 sets of U-Bolts). We offer U-bolts for the two most common residential chain link post sizes; 1 5/8" (41mm) typically used for in-line posts, and 2" (51mm) typically used for corner and gate posts. Please check your post sizes and order appropriately.