9 pin tube socket for 12AX7, 12AT7, etc., brown phenolic plastic base, tinned solder lug contacts, mounts from top of chassis, standard sized mounting centers, J-slot collar for standard sized tube shields. Fits through a chassis hole slightly larger than .75", mounting centers approx. 1&1/8". Affordable replacement for Belton sockets found in many modern amps including Fender.