Pattern Haskins/Starfleet Grey Spring
A replacement spring to suit Haskins/Starfleet garage doors up to 2135mm (7` 0″) wide.
The spring has 93 coils. with a length over coils of 470mm (18 1/2″).
An overall length of approximately 550mm (21 1/2″) 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.