CRL FA2540 26" Window Channel Balance - 2540 or 25-4
Stamped Number 2540 or 25-4. Number Stamped on Channel 2540 or 25-4. Each CRLFA Series 4/40 and 5/50 Weight Range Sash Balances requires one of several types of nylon guides to be riveted onto the top and bottom of the channel.