TargetsUSA swinging rail mover. With our rail mover You have an option to set the target either to swing or into swinging position. The rail mover housing is made of AR500 steel covering the nylon wheels that run on bearings. There are 8 wheels total, 4 travel wheels and 4 guide wheels that guide the mover on the rails. The rails are not included with the set but can be made of either wood or steel pipes.