Make 2 Fit PL 14624 Flat Window Spring, 3-1/8 inch (25-pack) These flat springs are constructed heat-treated steel and are finished in plated zinc. They feature a 3in wide arched span and are made of flat steel. These tension springs are used to hold window screens into sliding aluminum window screen channels and require two (2) 3/16in holes drilled 3-3/16in apart. Features Heat-treated steel tension springs Zinc plated, mill finished Requires two 3/16 in. holes Holds screen into aluminum channels For further dimensional information, please see the line drawing USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.