General description The 10PCS 9Pin Tube Socket Test Saver is designed to extend the life of the test sockets on your audio amplifier. This adapter is easily installed into each socket, taking on the wear and tear of inserting and extracting tubes, thereby protecting your amplifier's test sockets. If a Socket Saver becomes worn, it can be replaced without damaging the amplifier itself. Additionally, it can increase the height of the socket when the amplifier's panel opening is too small for the tube or adapter. Technical specifications Color: Black Material: Bakelite Package Contents: 10 x 9 Pin Socket Measurement allowed error: +/- 1-3cm