Two-Circuit MonoRail bends very easily by hand to almost any imaginable shape, but the pre-bent 90 degree curve makes Two-Circuit MonoRail even easier to install. Horizontal 90 degree curves are sold by radius, or the distance from the center of the circle to the outside edge. Join four 90o curves to create a circle with a diameter (overall width) equal to twice the specified radius. Rated for 300 watts per circuit at 12 volts. Each piece of rail is shipped with conductive connectors to join rail pieces end to end. Order additional connectos if cuttin and rejoining rails.