3/4" J-Bolt with Plate J Bolt Hinges For Large Heavy Driveway Gates, Steel, Iron, Wood or Aluminum Mounts on a 4" X 4" Post Hinge pivots on a steel ball bearing and includes a grease fitting to keep the bearing lubricated Hinge has a 3/8" X 11/2" welded plate with 2 holes to attach to an existing structure This hinge will swing a full 180 degree if installed without a stop The J-Bolt arm which attaches to the gate frame and is adjustible. Price is per Pair Threaded Bolt 7" Over all lenght,Sold in Pairs,Includes Grease fitting,Will fit on a 4" X 4" Post