Gallagher Distance screw insulator XDI (XDI offset screw-in insulator) (wood, 18cm, pack of 100)Suitable for cord and plastic wire No risk of short circuit Orange wear indicator shows when the insulator has to be replaced A robust offset screw in insulator for wooden post fences used to protect and electrify non electric fences. This cleverly designed offset insulator guarantees no shorts and features a handy 'wear' indicator to show when the insulator should be replaced. Comes with a 2 year product warranty.