1. Wire Gauge (Color Coded) - measure across 20 coils in inches, see the table on the right for your reference.
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2. Length of Spring (Coil to Coil) - Use a tape measure to measure the length of the spring from one end to the other when it is unwound exclusing the cones.
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3. Left & Right Wound Springs - Garage doors typically use a pair of torsion springs: one wound left (sometimes with red cone).
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All of our springs are made in United States. Following American Standards ASTM A229 with Coated Class II Wire, high quality and maximum durability.