<br>These are 25 / 42 Extension springs. <br>25″ long with 42 inches of stretch. <br>25″ long is industry standard for 7′ tall garage doors – these are the only length extension springs currently being manufactured. If the existing springs are not 25″ long – if you have the correct weight (pull) and door height springs, the balance will be correct. <br><br>Choose your door weight from the drop down menu <br>If your door weighs 50 pounds, you need 1 PAIR of 150# pull springs <br>All springs from 60 to 190 Pound Pull have double looped ends as pictured <br>These are extension springs that are mounted above the horizontal garage door tracks running from front to back of the garage door.