316 stainless steel shackles,marine grade,good polishing,Corrosion resistant - won't rust - long service life D shackle is corrosion and rust resistant,body and pin are the same size Stainless shackles work load limited:180lb Small shackle well finished,threads well cut,operate easily Long D shackle 5/32" (4mm) Marine Grade -4 piece JY-MARINE metal shackle made of 316 stainless steel, higher hardness, moisture-resistant, acid and alkali resistant, anti-rust, glossy and bright surface, non toxic, environmentally friendly and harmless. Solid design, abrasion resistant, strong load-bearing. Our sailing rigging shackle can be used for a long time.