The AceCamp 2-Hole Aluminum Guy Line Adjuster are line adjustors that are very simple to use. They fit 0.1 to 0.2 inch diameter ropes and cords, 10 per pkg. Anywhere a rope needs to be tied tightly, the AceCamp 2-Hole Aluminum Guy Line Adjuster will do the job better than a knot. It's quicker, easier and won't slip or jam. It's adjustable and adjusts as easily as it locks the rope in place. Keep several on hand for unexpected tie downs.