- Narrow, fully sealed construction
- Oil tempered carbon steel torsion spring
- Zinc plated variable pitch spiral
The Whitco Window Spiral Balance 680 suits timber or aluminium double-hung windows and is supplied with the standard foot attached. It assists the smooth sliding operation of both top and bottom sashes, with spring tension adjustable to suit the application. It has shock-absorbing stops and a corrosion-resistant stainless steel sash foot plate, and the outer casing is black.