Package Contents: You will get 4 pieces brass radiator keys, small and portable enough for you to use and replace, suitable for most radiators. RELIABLE MATERIAL: These radiator vent keys are mainly made of brass, they are sturdy and durable, not easy to bend or break, durable and can be reused for a long time; two holes on the top make it easy to hang and store. Functional: These brass radiator vent keys are designed for faucets and radiators and are compact for use in tight spaces; the wide handles allow for an easy and secure grip. Wide range of uses: The radiator plumbing valve key is suitable for faucets and radiators, and can also be used as a key for various valves. Dimensions: As shown, each brass radiator vent key measures 6mm/0.24" square; please check the size chart carefully before purchasing to confirm whether this key fits your radiator.