The tension spring neutralises the tension difference in the wire which is caused by fluctuations in temperature. It keeps the wire evenly tensioned during summer and winter, which means you can double (up to 15m) the distance between the posts. 

 Suitable for 2.5mm and 2.65mm HT wire and EquiFence. 

 Maximum tension strength 200kg. 

 Stainless steel, length spring 345mm, 

 Product warranty 10 Year.