High quality chassis mount B9A, 9 pin, valve base from Belton, very popular in guitar amps. Glass fibre filled PPS Insulating material. With panel saddle mounting, with phosphorus bronze terminal pins with solder plating. WIll fit a 19.5mm diameter cutout, fixing hole centres 28mm apart. The bases are mount from below, so you fit them within the chassis.
VT9-ST-1 (pack of 1)