There are 2 Kenmore belts with the exact same number. 20-5218 is the part number printed on 2 different size belts. 1 belt as listed here is for the 3 3/8" belt. The other belt is nearly double the length, about 6.25" in length. Both belts are grooved so they will not stretch. If you are not sure which belt you need, please measure your old belt and let us know which belt you need. The other belt is listed as the CB-6 belt