Pelican hook material: Stainless Steel T316 Marine Grade,Superior strength & rust resistance,strong and durable. Pelican hooks heavy duty,commonly used for safety rails where a quick release is needed Swage stud is internal thread: 6mm, right hand thread Quick release shackle end fits 1/8" stainless steel wire rope cable Package include:1 x pelican hook with swage stud JY-MARINE pelican hooks are commonly used for safety rails where a quick release is needed, either at the deck side or pushpit area where passengers get on and off the boat.