Hold on tight with the universal, knot-free, and fuss-free Nite Ize CamJam SlideLock Rope Tightener. Constructed from durable cast aluminum, this intuitive rope tightener allows you to tighten, tension, connect, and secure serious loads with knot a worry. The large Rope Tightener has a working load limit of 500 pounds (250 with included 10 ft. rope). Its easy to learn the ropes with CamJam. The SlideLock carabiner securely attaches and locks onto a D-ring, roof rack, tarp grommet, and various anchor points for a quick, confident connection. The simple pull-to-tighten cam mechanism allows you to feed in virtually any type of cord or rope and pull it tight for instant unbreakable tension around light to heavy loads. And yet, when you need to release, simply lift the quick-release lever to release the tension and keep it moving. The large Rope Tightener fits ropes 3mm to 9mm in diameter.