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If your window screen isn’t staying in place, don’t buy a whole new window – just replace the tension spring! These corner mount flat window springs hold window screens into aluminum channels safely and securely. These steel 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 and no tools are required! This corner mount flat window spring measures ¼” W x 2-3/4” L and slides into the corner of 3/8” or 7/16” thick frame. This pack of 25 springs is a must-have to keep on hand.