For left round and right wound garage door torsion springs, we have the most sizes at the lowest prices. This heavy-duty left wound torsion spring is .273 in. by 2 in. by 37 in. in size. Torsion springs allow a garage to be opened and closed, but they can wear out over time, especially on garage doors that are used as "front entry doors" for many homeowners. Match the size torsion spring you want with the torsion spring size listed in your owner's manual. Or, contact us to help you verify the right size.