- Narrow, fully sealed construction
- Corrosion resistant stainless steel sash foot plate
- Made in Australia
The Whitco Window Spiral Balance 420 suits timber or aluminium double-hung windows in the 2.25-7.25kg sash weight range and is supplied without the foot attached, so the matching foot is ordered separately. An oil-tempered carbon steel torsion spring works with a zinc-plated variable-pitch spiral for smooth, balanced sash movement, with tension adjustable to suit the application.
The spiral is held by a zinc diecast fixing plug inside a tough ABS polymer outer casing, and shock-absorbing stops are built in.