Towever E Track O Ring Accessories for Cargo Loads in Flatbeds, Trailers, Van, Trucks, Pickups Tie-Down(HD Steel, 10pcs) 10 Pack of 2" Clearance E-track O rings clip for trailer, van, RV tie down rails and e track tie down rails. Break Strength of 4,500 pounds and Working Load Limit of 1,500 pounds. Make enclosed trailer e track system to compatible for motorcycle, kayak e track strap. Also fit for tie off ropes. These ring cargo anchors are steel galvanized to protect against corrosion and rust. The E-track Spring Fitting Welded On To The O-rings Makes Them Compatible With The E-track/A-track trailer system To Install, Press The Lever On The E-track Spring Fitting To Attach And Detach From Rail Slot (NOT INCLUDED). You Can Also Weld These O-rings Onto Your Truck For Permanent Anchor Spot.