10.21 Spare Head for Copper Sleeves10. 21 Spare Head for Copper Sleeves Our extensive range of Nicopress tools and ferrules allow quick and simple termination or eye splicing of wire and synthetic ropes. The system is well proven, having been used in the aviation and yachting industry for 50 years. Ferrules are available in zinc plated copper for use with stainless steel cable, or in aluminium for use with galvanised steel cable. Either bench or hand tools can be used to terminate the