The Era F0 Type Spring Balance with Natural Plug is a meticulously engineered component designed to provide efficient and reliable sash balancing for windows. Specifically calibrated to accommodate window sashes weighing between 39lbs to 45lbs, this spring balance ensures optimal performance and smooth operation. Key features of the Era F0 Type Spring Balance with Natural Plug include: Weight Range Compatibility: Designed to support window sashes within the weight range of 39lbs to 45lbs, ensuring precise balance and stability for smooth window operation. Natural Plug Design: The natural plug design simplifies installation and facilitates seamless integration into various window systems, enhancing overall installation efficiency. Standard Length: With a length of 33 inches (838mm), this spring balance adheres to standard dimensions, making it suitable for a wide range of window heights and configurations. Durable Construction: Crafted from high-quality materials, t