ID tags are only valuable when they stay attached to your pet, which is why the S-Biner TagLock is a superior alternative to traditional split rings. Constructed of stainless steel with two high quality stainless steel gates, it has a center lock made of tough, durable plastic. With the S-Biner TagLock, you simply clip the ID tags to one gate and the D-ring of your pet's collar or harness to the other. Then, with a simple twist of the center lock, the gates securely lock and stay that way until you twist it open again. Sturdy, water-resistant, and ultra-secure, the S-Biner TagLock provides ease of use, but peace of mind.