These M12 connectors can use 3, 4 or 5 contacts and are made with halogen-free units and black bodies. These are available in many colors and are used with locking screws and wire gauges to make it work carefully. The M12 receptacles use the same number of contacts and can be mounted on the front or rear. This works with AWG 22 wires and a casted crimp area with an O-ring and Hypertac sockets.