Heavy-duty D-rings are constructed from high tensile steel,6 D-ring tie-downs have a 1,200 lb. rigging break strength and .Load load limit. are made of exceptionally sturdy heavy-duty zinc solid steel, to prevent corrosion and rust. Mounting Ring includes: 6 D-Rings , 6 Mounting Brackets , The size of each mounting bracket is 6x 2 x 0.3cm,D ring size 4.5 x 4 x 0.6cm,m,The hole above the bracket is 0.63cm. The anchors at D-ring requires the ropes, bungee cords or straps both and some basic hardware that can be easily attached to a metal or wooden floor. Widely used as anchor points on trucks, vans, kayaks, ATVs, caravans, vans, boats and trailers, they come in handy as wall hooks in garages D-Ring Attachment Ideal for Securing The Cargo in Boats, Cars, RVs, Kayaks, Off-Road Vehicles, Caravans, also Ideal for indoor use as well. If you have any questions or are unhappy with the product, please do not do not hesitate to contact us by e-mail