Gallagher XDI Screw-In insulator has unique advantages over traditional black screw-in insulators. Much stronger and robust due to their new technology, they are cleverly designed with a metal core. Suitable to use with wooden posts and polywire combinations, they are easy to secure to posts with their extra sharp point. The ring insulator guarantees no short circuits and is easily installed. The orange wear indicator shows when the insulator has to be replaced. Electric fencing sends a sharp but safe shock to the animals preventing them from breaking out or being disturbed by neighbouring animals. Always plan ahead before fencing and take into consideration the type of animals you have and the type of fence most suited to them. Wear appropriate gloves, clothing and safety glasses.