Series 303 Spiral Balance
The series 303 sash support system is used primarily in windows manufactured by Keller. Features a red tip spiral tube balance with an attached 15-010 nylon shoe, for a non-tilt window sash. The tube has a diameter that will actually measure 9/16" but it is considered 5/8" in the trade. Spiral window balances come fully lubricated and ready to be charged.