MantaRing - Cable Key Ring with Screw Lock - Strong, Flexible, Waterproof. One Ring for Keys and So Much More (5 Pack) (Yellow)
Strong and secure vinyl-coated stainless steel cable with screw-in lock, 6 inches long; 2 inch diameter when closed, Safe for aquatic use in fresh and salt water, Great for luggage tags, key chains, ID tags, Perfect for hiking, boating, swimming, fishing and diving gear