A thumbwheel edge switch in a black plastic housing. This high quality switch has gold-plated contacts on both the PCB & wiper to ensure reliable operation. The numbers 0 to 9 appear in the aperture in the front as the aperture is revolved & the operation is smooth & positive. The switches are front panel mounting with snap-in fixings & can be snapped together to form a bank of switches if desired. Connections are made as follows