All of Nicro's stainless snap shackles are made of investment cast 15-5 PH stainless steel, which yields a product that has both excellent corrosion resistance AND a high strength-to-weight ratio. The 15-5 PH alloy, which has been well known in the aerospace industry, will provide greater ductility with no sacrifice in tensile strength. C 5/8 E 3/8 L 2 11/16 Deforms at 2497 lb Weight 1.8oz."