This is the Heavy Duty 316 Stainless Steel Swiel Shackle Bolt Snap Hook Features: 316 Stainless Steel Shackle Bolt Snap. Very strong and durable. It can be used for a long time. Good performance. Semi-permanent attachment for positive retention. Threaded shackle attachment point. Not easy to slip. Easy to install and remove. Easy to install on BCD or harness D-Ring. Lightweight. Convenience to carry. Good Outdoor sports accessories for Camping Hiking Fishing and Water Sports. Heavy Duty 316 Stainless Steel Swiel Shackle Bolt Snap Hook