316 stainless steel shackles,marine grade,good polishing,Corrosion resistant - won't rust - long service life Stainless shackle work load limited:250lb Small shackle well finished,threads well cut,operate easily Mini shackle is great for jewelry and hardware,Using for stronger and safer attachment of dog tags to dog collars Stamped Shackle 5/32" (4mm) Marine Grade 5 pieces JY-MARINE stamped shackle made of high capacity stainless steel, which is rust-resistant and durable for both indoor and outdoor, even coastal applications.great for salt and fresh water applications,excellent for anchor rigging. Anchor shackle 5/16"the pin diameter is same with the body.they are sturdy and solid.