a front pin end 18 and a rear idc end 19 each idc end 19 includes a slot 21 having an open flared end 22 and a closed end 23 an apertured disk 24 of insulating material such as plastic includes a plurality of rectangular slots 26 which are arranged in a pattern corresponding to the pattern of the insulation displacement contact ends 19 the insulating disk 24 additionally includes a central aperture 27 which allows passage of an electrical cable 28 comprising a plurality of individual wires 29 each wire 29 includes a central conductor 30 the circular connector also comprises a removable backshell 31 having internal threads 32 and a circular shoulder 33 best seen in fig2 the backshell includes a central aperture 34 for passage of the electrical cable 28 fig3 shows the circular connector of fig1 and 2 in the fully assembled state the conductor 30 in each of the wires 29 has been forced to the closed end 23 of the slot 21 by the insulating disk 24 in use the cable 28 is passed through the apertures 34 and 27 in the backshell 27 and the insulating disk 24 respectively and the individual wires 29 are splayed from the cable end in order to be closely adjacent the flared end.