29 1/2" Length of metal channel. Double Spring invisible balance. Sash weight 38-42 pounds. End Bracket included 900-21263. Balance Number 172AX
SERIES A/AX BALANCE INSTALLATION
• Both "A" and "AX" balances are designed to counterbalance certain weights, regardless of the thickness of the sash. Do not overload.
• For odd height glass use the next smaller balance.
• When ploughing for over 36" glass height start at bottom of each sash, as always, and make groove the same length as you do for 36"
glass leaving extra wood at top of stiles.