- 2 x P728 springs support 90 lbs. to 150 lbs. garage doors
- 4 x P728 springs support 150 lbs. to 300 lbs. garage doors
- Length over coils: 28 in.
- Outside diameter: 1-5/16 in.
- Wire gauge: (0.177) no. 7
- Initial tension: 110 lbs. – 120 lbs.
- Maximum allowable stretch: 18.5 in.

























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