Genuine Haskins/Starfleet White Spring
A replacement spring to suit Haskins/Starfleet garage doors 2135mm (7` 0″) wide to 2743mm (9` 0″) wide.
The spring has 89 coils. with a length over coils of 480mm (18 7/8″)
An overall length of approximately 540mm (21 1/4″) including hooks and an outside diameter of 41mm (1 5/8″).
Springs are sold individually, although best working practice suggests that they should be replaced in pairs to ensure a properly balanced door.