20 Non-electric cable screw connections not of metal and also as divided cable screw connections; structural component parts of non-electric cable screw connections not of metal, in the nature of cable glands not of metal, namely, screw bodies, double nipples, reducer parts, extension parts, sealing inserts, cable inlets, O-rings, divisible flange-systems, shielding contact elements, conical discs, breather drains, connection threads, blind plugs, washers, flanges, flange angle parts, frames, pressure equalisation insert plugs, sealing plugs, screw plugs, coupling pieces, earth tags; structural component parts of non-electric cable screw connections and hose screw connections not of metal, in the nature of cable glands and hose glands not of metal, namely, lock washers made of plastic, collar bends, spiral springs, pressure screws, nuts, angular pieces, antikink parts, bending protection parts, clamping rings, clamping nipples; all the foregoing being non-metal fasteners and non-metal hardware