Surface Mount Tie Downs D-Ring 4,000 lb. Capacity Tiedown 8-Pack 4,000 lb. rating (straight pull). WLL is 1,333 lb. capacity*. The tiedown attachment is secured with one 3/8" diameter mounting hole and a 1/4" rivet. This steel attachment is zinc coated to inhibit corrosion. This attachment measures 3-3/4" wide x 5" long. The 1/4" diameter ring measures 1-1/2" wide x 2" long The "top cap" is 11 gauge or 1/8" thick. 1/4" drain hole.