PL7758 Heat treated steel tension springs hold window screens into sliding aluminum window channels. Requires (2) 3/16" holes drilled 3.19" apart. Features: -Tension spring. -Color: Zinc. -Material: Spring steel. -Plated finish. -Requires (2) 0.19" holes drilled 3.19" apart.. Specifications: -Type: Flat. -Dimensions: 5.44" H x 3.81" W x 0.63" D.