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C.R. LAURENCE FC151 CRL 19-1/4" Overhead Channel Balance # 151. This CRL Overhead Channel Balance will replace a 9/16 inch (14.3 millimeter) balance used in aluminum windows made by Premiere, International, A1 Aluminum, Marshall, Guaranteed Products and others most commonly found on the west coast. This balance will accommodate a 4 to 7 pound (1.8 to 3.2 kilogram) vent weight. It is easy to install and nylon guides are not required. If the window uses a lift hook, use our Cat. No. H3904..