🔧 Upgrade Your Window Game! Perfect for replacing old balances or retrofitting vintage pulley systems. Experience effortless sash movement with a 6 lb counterbalance per cable. Use one or two balances per window for optimal performance, accommodating up to 12 lb sashes. Engineered with all-steel coil spring retraction for durability and reliability. Includes two steel cable lifters for seamless operation of upper and lower sashes. Steel cable lifters Retrofit ready 6 lb balance The Prime-Line H 3578 Wood Window Sash Balance is a robust solution designed for effortless window operation. With a 6 lb counterbalance and dual steel cable lifters, it ensures smooth movement for both upper and lower sashes. Ideal for retrofitting old systems or replacing existing balances, this product features all-steel construction for long-lasting performance.