Springs engineered to counterbalance door weight. Springs can be made in various inside diameters. We sot springs with inside diameters of 2”, 2 5/8”, 3 3/4” and 6”. Typically mount on a hollow tube or a solid shaft and are secured to wall by a spring anchor bracket.
Warning: Springs can be under extreme tension and can cause injury to inexperienced persons. Torsion springs should only be adjusted/installed by experienced technicians.