Pocket Knot Line Tensioner Cord Reducer An innovative, unique, and straight forward device with impressive multifunction capability. Secure things easy and fast-Cord Tensioner, Tightner, Adjuster, Lock, Splicer, Extender. Great for adjusting or removing slack from existing cords/ropes/lines from within its diameter limit Secure items on a bike, in the trunk of a car, in the bed of a truck, on the car roof rack Rig up a tarp or canopy,put up a hammock, a clothes line, secure a guide line, a bear bag