P728 28 in. Plug-End Extension Spring is a Holmes spring replacement for heavier one-piece garage doors as well as for toy haulers using lift springs. We recommend replacing all springs at the same time for balanced door lift and even wear. A c-hook is required for a single spring installation while a w-hook is required for a double spring installation - available separately.
- 2 x P728-C springs support 90 lbs. to 150 lbs. garage doors
- 4 x P728-C springs support 150 lbs. to 300 lbs. garage doors
- Length over coils: 28 in.
- Outside diameter: 1-5/16 in.
- Wire gauge: (0.177) #7
- Initial tension: 110-120
- Maximum allowable stretch: 18.5 in.
- Manufacturer warranty: 1-year