Description For use with electric fencing applications in increasing the tension in the fence wire. Best when used with a strainer handle. Tensioners should be installed every 1,500 - 2,500 feet. They should be located in the middle of a fence span (for example, halfway between two corner posts.) Has a spring to hold the latch-flipper tight against the cog spool, which makes tightening safer. Galvanized strap & Aluminum spool.