Product Name: Spring Round Snap Clip Color: Silver tone, Material: These round locking carabiners are made of zinc alloy, making them light weight but durable.   Firm Trigger Snap: sturdy and durable, open and close smoothly. Designed with built-in spring, making the item very easy to use and convenient to take along. Lobster claw snap hook with spring-loaded automatic gate for extra security. Metal swivel clamp opening makes using clips easy and holds a tight grip. Size: 1 inch/25mm, Thickness: 0. 2 inch/5mm.   Package Contents: 4 x Spring Round Snap Clip   Application: Spring O rings are suitable for making harnesses, clothes and luggage belts, handbags, keychains and dog collars.