Round bend (w/ 2 nuts & strap)U-Bolts with a round bend. These bolts come with 2 nuts and a strap included. Zinc plated steelSteel is zinc plated for moderate protection against rust. Stainless steel 18-8 Stainless steel 18-8 is an alloy of steel with high corrosion resistance. Stainless has become the material of choice for exterior and most marine applications.Â