This tool helps you tighten your high-tensile wire on your electric fence. The in-line strainer with compression clip applies high-tensile compression on high-tensile fence line. Can be adjusted using a standard wrench. Under compression, it automatically feeds into cog reel. Galvanized to deter rust. Install strainer every 2,000 to 2,500 feet and should be located in the middle of long runs of wire or between two corner posts. Strainers will need to be placed more often when there are corners, bends, dips or rises in the fence.