Standard BT type 4-way & 6-way Line Plugs using Insulation Piercing Contacts IPC with strain relief. To fit the flat line cord shown in the Cables Section to an IPC plug simply provide a clean cut across the end & strip off 11 to 12mm of the outer sheath. Allow the wires to separate from one another by Approx. 1mm then push & tease them gently into the plug which has locating guides built in for each conductor. Once fully home the coloured wires can be seen through the slot behind the contacts use heavy duty pliers or a small vice to press all the gold coloured contacts flush with the plug body push down the small strain relief members immediately behind the contacts then force down the cable clamp at rear.