The cleanest way to attach a load using straps up to 1.5" wide, luggage loops are also large enough to pass ropes and bungee cords through. The strong, lightweight, black anodized cast alloy loops attach with stainless steel hex bolts and nylon lock nuts. Bonded alloy and rubber washers. 1-5/8" center-to-center hole spacing. First Cabin all the way. Set of 4 loops and fittings.