The SE Snap Hooks, 5/16" x 3-1/8" (10-Pack) are economical, reliable, and self-closing. They are perfect for a huge variety of applications including securing cable barriers, hanging signs, quickly connect and disconnecting chains, ropes, and more. The self-closing design locks in place and stays securely closed, is easy to release, and has a maximum jaw allowance of 3/8" when open. The dimensions of the wide end is 15/16" inside and the dimensions of the narrow end is 7/16". The approximate size, link diameter, and length is 8 mm x 80 mm (5/16" x 3-1/8"). They have a simple and effective design and are easy to fit on the site. SE is committed to providing the customer with the best source for value possible on the market. You will enjoy the quality, function and usefulness of our SE Snap Hooks, 5/16" x 3-1/8" (10-Pack).