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 - .169 (5/32"), B - .235 (1/4"). Use with corner keys model No. PL14954 (Sku 262922) and PL14956 (Sku 262959). White. 20 per pack.