... wire,then insert to tube,use pincers to fix themfeature:nylon shell, long copper tube,easy to conduct electricity and hold wire ... tightly!· size:D3,D4,D5,D6,D7,D8,D10· Shell material: Nylon ... insert to tube, use pincers to fix them.· Feature: Nylon shell , long copper tube , easy to conduct electricity and hold wire tightly ...