Durable Material: the exhaust valve switch is constructed from zinc alloy, designed to withstand wear and tear while providing reliable use over time; Universal Compatibility: This radiator key features a 5 x 5mm (0.2 x 0.2 inch) square hole, making it suitable for most radiator bleed valves for easy air release; Convenient Design: Each radiator key is equipped with a pre-drilled hole for easy carrying and storage, ensuring you never lose it when you need it most; Versatile Use: Ideal for both indoor and outdoor applications, this exhaust valve switch can effectively lock faucets and is compatible with various plumbing tasks; Value Pack: Each purchase includes 5 pieces of radiator keys, providing you with a sufficient quantity for all your daily plumbing needs

What's in the box
5 x Switch Wrench