Coil Spring 1/2 in. Constant Force, 3.5 Pound 1-1/4 Univers

Universal Constant Force balance for single or double hung sliding windows with 1.25 in. pocket Pocket Width: 1.25 in. Coil thickness: 1/2 in. Weight Capacity: 3.5 pounds Number on Balance is located on the end, sometimes hard to see Available in several weight capacities: 3.5, 4.5, 5.5, 6.5, 7.5 and 9 pound. Coils can be mixed together to match appropriate sash weight Sold as coil only. Can be combined with other parts to make balance - coils, support covers, brake shoes and pivots sold separately