Prime-Line Products PL 7726 Screen Frame Corner, 7/16-Inch by 3/4-Inch, White Plastic,(Pack of 4) 3/4" x 7/16" Plated Slotted Steel Strapping Nylon Screen Frame Corners Plastic corners are used to assemble 7/16in. thick window screen frames Square-cut installation for fast and easy construction White Vinyl Durable Plastic Material