... shock absorbing.Closing speed can be adjusted. 3-in-1 door closer hinge 1.Specifications Shaft DiameterΦ24mm Page Length 171mm Expanded ... , simplicity, flexibility, easy operation.2) no harm to the door, frame, wall and other home structure4 high safety factor usage ... large pressure.2) due to the shock absorbing, make the door and door frame not destroyed ,meanwhile prolong the working life 5 ...