If your window screen isn't staying in place, don't buy a whole new window - just replace the tension spring with the Make 2 Fit PL 14631 Corner Mount Flat Window Screen Replacement Spring! These corner mount flat window screen springs hold screen windows into aluminum channels safely and securely. These springs are used in window corners to keep them in place with tension. The easy push in design of the springs fit most window screens. These steel sliding window screen tension springs are heat-treated, zinc-plated, and mill-finished, so they are strong, durable, and made to last. Plus, installation is quick and easy with no tools are required! This corner mount flat window spring measures 1/4" W x 2-3/4" L and slides into the corner of 3/8" or 7/16" thick window screen frame. This pack of 100 springs is a must-have to keep on hand.