DIN type connectors, with screw locking rings. Used on Nagra recorders, Arriflex cameras, and many older microphones manufactured by AKG, Sennheiser, Beyerdynamic and others. Large bush version, accepts cables up to 8mm diameter.
Connectors have cable clamps and glands, and are for use on cables. Chassis types are not stocked, but are available to special order, minimum order quantity 10 pieces.