The Thunderbird EF-27 300mm Poly Tube Offset Insulator 50 Pack provides a reliable and durable solution for electric fencing. Designed to create a 300mm offset from fence posts, these insulators help keep electric wire clear of posts, vegetation and other obstructions. Made from tough poly tube for long-lasting outdoor performance, they are easy to install and suitable for a wide range of electric fencing applications. Supplied in a convenient 50-pack, they are ideal for both new fence installations and extending existing fencing systems.