White 4-1/2 in exterior 90 (or vertical outside 90) is for outside corners used with 4-1/2 in W channel lengths. One-piece. Clips on duct cover for seamless look, no screws needed. Use box cutter to trim excess for a customized fit.
RectorSeal® Cover Guard™ 90 deg External Elbow, 90 deg, 4-1/2 in Size, For Use With: Cover Guard™ Adjustable Line Set Covers, White, 4 to 140 deg F, 6.3 in Length, 6 in Width, 6.3 in Height