Designed for safety, the lock and release trigger makes sure that once the Lock Jaw is clamped down, the only way it's coming off is when you push the trigger. Simply push the lock forwards and squeeze the trigger and the Lock Jaw quickly and easily removes. Made from steel and high strength thermoplastic resin, the Lock Jaw is designed to take a beating. This is no disposable gimmick safety device. From the first time you hold it, you know it's meant to keep you safe.