Pair of 130lb. Heavy Duty Garage Door Extension Springs Stretch Springs, 25" Long,Double Loop Ends, High Precision Electrophoresis Black Coated, MIN 16,000 Cycles, for 7ft High Garage Doors

DIMENSION: One set of 130 lb heavy-duty garage door extension springs (Yellow). These are 25 inches long at rest and 67 inches long when fully extended. They are suitable for configurations on residential doors that are no taller than 7 feet. PACKING INCLUDED: One pair of garage door extension springs, one pair of non-slip gloves, and installation instructions are contained in the package. HIGH QUALITY: Constructed from professional ASTM-A228 spring steel coils that have undergone heat treatment to provide very high durability. The advanced electrophoretic coating technology delivers superior corrosion resistance and tensile properties. Salt spray testing endures up to 300 hours with a minimum of 16,000 cycles (a cycle is one open and close of the door). DOUBLE LOOP ENDS: They are more robust than open loops, as there are two coils of the spring that connect to the eye-bolt and the pulley. This is the optimal replacement choice available (you can substitute any end type with double looped). It is strongly advised that you replace springs in pairs. Usually both springs are of identical age and wear. As one has broken, the second spring will probably reach the end of its cycle and fail shortly. A newer spring will possess greater pull than an older spring, which can result in the door opening and closing with an unequal amount of pull on each side. This may lead to damage to the door and the garage door opener, and is hazardous