Galvanized steel segmented bend 90° Radius r = 1 x D Application Spiral fitting for turning air through 90 degrees. Material Galvanized Steel Composition Manufactured to DW144 Other Available Products Other angle bends available - 15° BF15 30° BF30, 45° BF45, & 60° BF60 For 224 mm diameter and below see B9 Order Example BF90, 250 Explanation : BF90 = Bend type 250 = Diameter of bendhttps://www.sksales.co.uk/pdf/UK/DS/UK-EN-C01.007.SK-BF90.pdf