The Single Spring Operator Assembly with 48 Inch Spring is a practical and efficient solution for most single spring operator assembly applications. With a choice of 89.5 or 96 inch shaft length, this assembly features a heavy-duty .243 diameter spring wire and a single counterbalanced spring design for effortless operation. The heavy-duty cast aluminum cable drums can hold up to 130 inches of cable, ensuring durability and reliability. Additionally, the quick and easy counterbalance spring adjustment, along with easy calibration to door size and weight, makes this assembly a convenient choice. Tested with rust preventative, this assembly guarantees long-lasting performance.