The Single Spring Operator Assembly with 60 Inch Spring is a practical and efficient solution for most single spring operator assembly applications. With a heavy-duty .243 diameter spring wire and a single counterbalanced spring design, this assembly ensures effortless operation. The assembly features quick and easy counterbalance spring adjustment, allowing for easy calibration to door size and weight. Available with shaft lengths of 89.5, 96, or 98 inches, and tested with rust preventative, this assembly is built to last. The heavy-duty cast aluminum cable drums can hold up to 130 inches of cable, making it a reliable choice for any project.