Compatible with faucets and radiators, and can be used as wrenches for different kinds of valves, fits many radiators in the market, easy to use. The radiator valve air vent bleed hole keys are available in 3 styles with sizes of 22x19mm, 29x22mm, and 23x26mm, and feature a 5x5mm aperture. These radiator valve bleed keys are designed to release trapped air from radiators and valves, helping restore proper heating efficiency, they can also be used as small wrenches for faucets and various valve types in household maintenance tasks. Every radiator lock key features pre-drilled hole for convenient carrying and storage, not easy to get lost. This set includes 3 different styles of bleed keys, with 2 pieces of each type, multiple designs allow compatibility with various valve shapes and sizes., Manufacturer: Micro Traders