Gallagher Distance insulator, metal (Offset bolt-on insulator) (M6, pack of 10)Offset bolt on insulator for electrifying and protecting non electrified concrete or iron fences Suitable for cord and plastic wire (up to 9mm) 2 year product warranty. An offset bolt on insulator used to protect and electrify non electric, concrete or iron post fences. The insulator is suitable for cord and plastic wire (up to 9mm) and sits 20cm from the post. Comes with a 2 year product warranty.