Features: Discover the set of 4 radiator bleeder key, expertly crafted from aluminum alloy for durability and reliability, making it a essential tool in your toolboxes. These radiator key is hard anodized to withstands wear and tear, ensuring easy ventilation even in tight space with square socket for most radiators. For maintenance professional, engineers, and DIYer enthusiasts, this set is perfect for anyone needing efficient radiator bleeding without hassle. Perfectly suited for use in residential, commercial, and industrial setting, these key is indispensable for maintaining hvac systems, plumbing, and gas equipment. Say goodbye to excessive noise and enhances heating efficiency by regularly using these radiator bleeder key, designing to provide a seamlessly operation experience. Specifications: Component:Steel Four-corner key Size:Approx.24.6x20.3x9mm/0.96x0.79x0.35inch Bayonets diameter: Approx.5mm Extended four-corner key Size:Approx.23.2x26.4x9mm/0.91x1.03x0.35inch Bayonets diameter: Approx.4.9mm Color:Silver Package Includes: 4pcs Radiator Bleeder Wrenches note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual coloring of the item. Thanks for your understandings.