This is a new CNC machined extended rear miter box shaft for a 2 wheel drive Rokon motorcycle. This will allow the installation of a rear disk brake. It works with a standard keyed output sprocket, but it will need a new keyed input sprocket or you will have to have a keyway and set screw hole installed in your existing pinned input sprocket. This shaft is also keyed for the miter gear. The brake rotor uses the same key as the input sprocket. The shaft is 9 inches long. 2 new #606 keys, a 3/16″ diameter split pin and a 3/16″ square key are included. This will not work in a “Plunger” transmission or a front miter box.