Carrier only-springs must be ordered with this item

Introducing a “Drop-in” balance for sash windows from the most technologically advanced window spring company. Offers the following:

• low cost and a reduction of on-hand inventory
• higher weight AAMA qualified springs-can hold up to 80 lbs. per sash
• Extended travel of up to 45″ per sash. Not offered anywhere else
• quiet operation with low operating forces
• superior cam strength & reliability
• Patents: #8,458,878 / #8,640,383 / #9,334,683 / #9,371,677 other patents pending