The PHILMORE MFG. part 504KB is a high-quality 3.5mm stereo phone jack specifically designed for professional audio applications. This solder lug connection jack features 3 positions and is intended for secure panel mounting with its ST panel mount design. The jack consists of 3 terminals and a single port, ensuring reliable audio connections. This product is available in bulk quantities, making it a perfect choice for manufacturers and audio professionals looking for a dependable and cost-effective solution for their audio setups.