General description These 20 pieces of Ceramic B9A Silver Plated 9Pin Vacuum Tube Socket Panel Chassis Holders are designed for various vacuum tubes including ECC81, ECC82, ECC83, EL84, and 6922. They provide a reliable and durable connection for your audio equipment. Technical specifications Screw hole distance: 24mm Total length: 34mm Material: Metal with silver plating Other information Package Contents: 20 x 9Pin B9A Ceramic Vacuum Tube Sockets Note: Light reflection and different displays may cause the color of the item to differ slightly from the actual product. The measurement allowed error is +/- 1-3 cm.