Set of two, sold as a pair only. The locking/opening mechanism and attachment to the stays function without issue. The exterior has been treated with Barrier Coat for protection and reflective tape has been applied. Condition: Poor overall condition - Exterior: Noticeable whitening and shine due to scratches and scuffs. - Interior: Numerous scuff marks from luggage. - One of the two: The opening stopper screw has become loose and has been repaired with adhesive. * The stopper screw may require further repair in the future. Regarding the keys: The keys open and close the locks without issue. A one-key system key is also included, but its functionality has not been confirmed. Important Notes: A separate Monokey base/pannier holder is required for installation. Please purchase only if you are satisfied with the exterior condition of the item as it is currently presented.