The Invisible Balance has been used for over 25 years, primarily for wood windows. They are an excellent choice for historic window renovations, eliminating exposed hardware and maintaining the original window appearance. This product is the favorite of the custom millwork industry when jambliner aesthetics are not acceptable. Mounted in the side of the window sash.
"A" type: Single Spring
"AX" type: Double Spring

End Clip for channel balance. If buying separately without balances, must order 25.…