This listing is for ONE (1) tie down attachment, and 2-1/2"L hardware kit. Hardware Kits = 2 - 3/8" x 2-1/2" long bolts, 2 fender washers, and 2 nylon locking nuts. The heavy duty d-ring has a 12,000 lb. vertical pull weight rating*. The ring and backing plate are zinc coated to inhibit corrosion. These surface mount D-rings are also available without Backing Plates. The backing plate is used for support under the floor when installing the attachments, and prevents the bolts from pulling through. *RATED CAPACITY: Also known as "assembly capacity" or "break strength" is the minimum load a complete assembly can withstand before failure in a laboratory pull test when the product is NEW. WORKING LOAD LIMIT: The maximum load weight a tie-down should be subjected to during normal use. To assist in making the proper tie-down choice the Federal D.O.T. requires the W.L.L. to be 1/3 of the Rated Capacity.