ITEM NAME:4Pcs 8 pin ceramic socket tube top vacuum octal value for KT88 6550 EL34 6S M&E 8 foot tube socket, scaffolding with mounting holes, 38.7mm panel, opening 26mm for KT88 6550 EL34 6SN7 and other electronic tubes Material: Ceramic + Copper Plating Color: Gold Working Voltage:1500V Contact Resistance more than the 0.01Ohm Size(approx):48.5 x 31.5mm Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm..Opening 26mm for KT88 6550 EL34 6SN7 and other electronic tubes. Fit for:KT88 6550 EL34 6SN7,ect. 8 foot tube socket, scaffolding with mounting holes, 38.7mm panel. Material: Ceramic + Copper Plating.