Campbell Chain and Fittings T7645016 Spring Snap Link, Steel, Zinc Plated, 5/16" [Pack of 10]. Ideal for hanging keys and other utility items from belt. Fast and easy to connect and disconnect. Do not exceed the working load limit. Do not use for overhead lifting or hoisting. Do not use to support human weight, for playground or athletic equipment, or as a safety device. Trade Size: 5/16", Finish: Zinc Plated, Material Diameter: 0.23", Length: 2.4", Opening: 0.29", Eye Diameter: 0.37", Inside Width: 0.31", Working Load Limit: 130 lbs. Material Number: T7645016.