18 in. L Window Channel Balance 1720 with 9/16 in. W x 5/8 in. D Top and Bottom End Brackets Attached

The balance number will be stamped or printed on the metal channel which determines the spring tension. The length of the balance is determined by measuring the metal channel only and do not include the plastic end bracket guides in the measurement. This balance channel 9/16 in. W x 5/8 in. D Make sure your balance matches the specs of this balance before ordering as well as the specific end brackets.|Aluminum metal channel for strength|Designed for longer life when you change balances on both sides of the sash|Provides smoother operation when you change balances on both sides of the sash|Best operation when you replace balance and both top and bottom end brackets