or round grooved pins. Steelgear's wide range of marine grade R Clip are manufactured in A4 AISI 316 stainless steel. All our R Clips are supplied in a variety of sizes with the smallest at 2mm in diameter by 40mm length and the largest at 6mm diameter by 110mm length. Our most recent addition to this range is Zinc Plated material, which is much cheaper than stainless but does not have the same excellent corrosion protection.