100 Pack, 3/4", Metal Miter-Cut Screen Frame Corners, For 1/2" Lip Frame Corners, Aluminum, Gauge .040, For Use On Screen Frame Size 3/4" x 7/16", Concealed Screen Corners Designed To Fit Into Aluminum Lip Framed Screens, Constructed With 45 Degree Mitered Cuts Provide Durability & Longevity.