Genuine Gold plated TANNOY grade 4mm speaker speakers sockets (WITH INSULATOR)
Tannoy did use various suppliers, so occasionally they "sit higher" once installed.
Some Tannoy back plates (some Cheviots, Eaton, Berkeley etc) have an anodised metal insert plate, these insulators solve this).
Accepts 4mm plugs. Threaded part approx 3.8mm, hole for wire approx 5mm and will accept 4mm plugs also.
DO NOT CONFUSE THESE WITH MANY CHEAP VERY INFERIORS TYPES.