Features: Discover the set of 4 radiator bleeder keys, expertly crafted from aluminum alloy for durability and reliability, making it an essential tool for your toolbox. These radiator keys are hard anodized to withstand wear and tear, ensuring easy ventilation even in tight spaces with a square socket designed for most radiators. Ideal for maintenance professionals, engineers, and DIY enthusiasts, this set is perfect for anyone needing efficient radiator bleeding without hassle. Perfectly suited for use in residential, commercial, and industrial settings, these keys are indispensable for maintaining HVAC systems, plumbing, and gas equipment. Reduce excessive noise and improve heating efficiency by regularly using these radiator bleeder keys, designed to provide a seamless operation experience. Specifications: Component: Steel four-corner key Size: Approx. 24.6 x 20.3 x 9 mm / 0.96 x 0.79 x 0.35 inch Bayonet diameter: Approx. 5 mm Extended four-corner key Size: Approx. 23.2 x 26.4 x 9 mm / 0.91 x 1.03 x 0.35 inch Bayonet diameter: Approx. 4.9 mm Color: Silver Package Includes: 4 pcs Radiator Bleeder Wrenches Note: 1. Please allow 1-2 cm errors due to manual measurement; ensure you do not mind before ordering. 2. Due to differences between monitors, the picture may not reflect the actual color of the item. Thank you for your understanding.