Square-Cut Screen or Storm Window Kit. This kit contains: (4) Lengths aluminum framing material including vinyl spline; (4) Corners. 5/16 inches x 3/4 inches (8 mm x 19 mm) frame/marco. Makes a screen up to 60 inches (152.4 cm) x 60 inches (152.4 cm). Installation instructions: Materials needed: Screen cloth (Aluminum or fiberglass); Required attachment hardware. Made in the USA.