THE ONE WAY ANCHOR VISE WORKS LIKE A ZIP TIE, ALLOWING WIRES TO RUN THROUGH ONE WAY, BUT CATCHING THEM BEFORE SLIDING BACK THE OTHER DIRECTION. IT'S USEFUL FOR GRAPE TRELLISES, BUT IS EQUALLY HIGH QUALITY WHEN RUNNING WIRE FENCING. ITS STRENGTH AND RELIABILITY ARE PARAMOUNT, AND THE ONE WAY ANCHOR VISE DELIVERS.