These unique METER PLUG LOCKS fit angle valves and curb stops in .75", 1" and 1.25" sizes so you can effectively stop unauthorized access to gas or water resources when it becomes necessary to remove a meter. METER PLUG LOCKS are constructed of stainless steel to prevent rusting and corrosion. Using the special wrench shown, simply thread in the METER PLUG LOCK until it recesses. This eliminates any protruding surface to attack. The bore of the plug is of a special shape so that the METER PLUG LOCK can only be removed with the wrench.