F plugs for use with solid centre conductor cables. The crimping ring should be slipped over the outside of the cable first then the plug simply pushes onto the cable between the inner sheath & the screen. The centre wire of the cable is the centre pin of the plug. The crimping ring should then be positioned correctly over the plug & crimped tight. Available in three sizes to suit CT100 or RG59 type cables or cable with a 5mm centre insulator.