This is a first class, top-of-the-line trigger lock. Hardened alloy construction with double-sided rubber lining. Security keyed lock. Steel and Zinc body for maximum durability, with a 4-Pin tumbler cylinder that helps prevent picking. Adjustable width - universal fit. Soft rubber pads protect gun finish. Ergonomic design facilitates rapid installation. Secure twist open/closed mechanism. A special key is needed to unlock (2 keys are included.) Protect your airguns and firearms against unwanted use. Keep your family safe.It's the right thing.