The Big Figure 9 eliminates the frustration of tying, adjusting and untying knots. Rope tightener/tensioning tool fits rope sizes 16 mm. to 8 mm. Pull it tight, keep it tight!Quick tying secures most loads. Pull to adjust rope tension. Works in two ways; secure to the end of a rope or any location along the length of a rope. Rope tension is easily adjustable - high rope tension is easy to achieve and maintain. Lock off the end of the rope with one quick move - no slipping, unlocks just as easily! Solves the problem of securing the awkward loads (Christmas tree, mattress) onto car roofs. Multiple Figure 9s can be used to align and hold objects in position - tarps, banners, new trees, construction, etc. Manufactured of strong aluminum - strength tested. Instructions for use are permanently laser engraved into the surface. Load limit: 300 lbs. Fits rope sizes: 5/8" (15mm) to 5/16 (8mm) Size: 3 x 2.25 x .25 in. Wt. 1.1 oz.