The FM37 Protective Cover protects the lens window from impact and scratching. Applying thumb pressure to the locking tab releases the cover; a spring mechanism keeps the open cover out of the way by holding it flat against the flashlight. A cam-locking lever keeps the entire unit securely attached to the flashlight. Fits: 1.25" bezels, including Z2, C2, C3, G2Z, G2, 6P, 9P