Switchcraft Type 12A Littel-Jax shorting type phone jack. The switched terminal is normally closed and is usually connected to ground to eliminate hum when unplugged. Includes nut and washer Type 12A 0.275" bushing length (standard) or 0.375" bushing length (long) Mates with standard ¼" plugs and is available with 0.25" inside diameter bushing. Mono 2-Conductor. Includes nut and washer Tip is shunt