Feature●1.10 - 5/16" x 5/8" TRACK BOLTS AND LOCK NUTS.●2.Garage Door Cables, Springs, and attachments are under significant load and installations, adjustments and replacements should be performed only by a trained professional.●3.Spring containment cables should be used in conjunction with Extension Springs.Description 1.10 - 5/16" x 5/8" TRACK BOLTS AND LOCK NUTS. 2.Garage Door Cables, Springs, and attachments are under significant load and installations, adjustments and replacements should be performed only by a trained professional. 3.Spring containment cables should be used in conjunction with Extension Springs.