- This is a 5L Belt – 5/8″ Wide on the outside – 7/16″ Wide on the inside. This is a cogged belt. If the belt is broken, measure the length of the belt, in this case the belt is 30″ long (300) The width is also a factor, measure the width at the outside of the belt. This belt will work for all other brand openers and applications as long as the size is correct.