National Hardware Rail Hanger, 6 in, 225 lb Weight Capacity, 2 in L x 3 in W x 2 in H Dimensions, Steel, Zinc, 2, Pack, For: Model #59, #5100, #5103, #5104, #5105, #5110, #5114 or #5116 Box Rail, Includes: Truck, Connecting Bolt, Nuts