The S-Biner MicroLock is a great size to hold and organize keys to rings or for organizing other smaller items. With its added twist-to-lock center lever, it locks preventing any unintended or accidental openings. Made of high quality stainless steel, the S-Biner MicroLock features a center lever made of durable plastic - a simple twist effectively and securely locks the gates, and keeps them that way until you twist it open again. Great for removing a single key from a ring to take on a run or ride, give to your mechanic, or leave for a friend.