Reproduction Indicator (1-Wire) suitable for use with Chaly 6VPlease note these indicators do not come with the fitting stalk which is required to mount them to the motorcycle. As this light unit uses a single wire, the metal body is used to earth the light. For the light to work correctly make sure the light body has good metal to metal contact with the bikes frame so they can earth properly. Outer diameter (approximate): 75mm Overall depth (approximate): 84mm Mounting hole (approximate): 14mm Lens depth