Used in the corners of triple-track or self-storing type storm windows. A = top width, B = top height, C = bottom width, D = bottom height, if A and B dimensions only indicated then both legs are equal. A - .210 (7/32"), B - .180 (3/16"). Use with corner keys Model No. PL14952 (Sku 279013) and PL14958 (Sku 279021). White. 20 per pack.