- Fully sealed construction, weight range: 7.25 - 10kg
- Oil tempered carbon steel torsion spring and zinc plated variable pitch spiral
- Steel zinc diecast fixing plug and tough ABS polymer outer casing
The Whitco Window Spiral Balance 660 suits timber or aluminium double-hung windows and is supplied without a foot; order the matching foot separately. It provides smooth, balanced sash movement, with tension adjustable to suit the application, and has shock-absorbing stops. It is recommended that the balance is supported in a 15mm x 15mm rebate.