Heavy Duty USA Tiedown Anchors With Backing Plates, Surface Mount D-Ring 6,000 lb. Capacity, 4-Pack This listing is for four (4) zinc plated steel D-rings. This is a home grown product manufactured right here in the USA. Each ring provides a strong 6,000 lb. rated break strength (straight pull) with a W.L.L. (working load limit) of 2,000 lbs. The zinc plated coating provides a weather resistant barrier. 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. APPLICATIONS: These versatile tiedown attachments can be used on the floor of an enclosed or open trailer to secure cargo, tie down motorcycles, ATV's, lawnmowers, light automobiles, or just about anything that needs to be secured during transportation. SPECIFICATIONS: Specifications are illustrated in the secondary image, here are the written dimensions: The 3/8 diameter ring measures 2-1/4 wide x 2-1/4 long on center. The TOP CAP is 1/8 thick. It measures 1-3/16 wide x 3-1/4 long, with 3/8 holes on 2-5/16" center. To get a comparison feel for the size of the d-ring in relation to other d-rings please see the third image provided. BACKING PLATES: The USA made backing plate is used for support under the floor when installing the d-ring attachments, and prevents the bolts from pulling through. The zinc coated steel backing plate measures 6 in X 6 in. Thickness is 11 gauge (slightly less than 1/8). Multiple hole configurations for use with 8 varieties of attachments. Each plate weighs 1.05 lb