A versatile product which can be used in-line or at the end of a fence, with built in over-stretch protection. The tension spring offsets the expansion and shrinkage of wire caused by temperature fluctuations and keeps fence wire evenly tensioned during summer and winter. Maintaining the tension on fence wires also prevents excessive strain on end or corner posts - reducing maintenance costs. Suitable for 2.5mm and 2.65 wire. Maximum tension strength 200kg. Comes with a 10-year warranty period.