The Nite Ize No 4 S Biner Slidelock will organize, connect, carry, and keep your valuables extra secure! It is made of high quality stainless steel and features two simple, innovative plastic sliders that slide into place to keep the gates securely closed. Each gate can be locked independently for convenient access. The S-Biner gates will stay firmly locked until you choose to unlock them, allowing for simple and secure linking , attaching, and carrying.