An extremely versatile lead design, it is length adjustable, can also be used as a temporary tether or to connect from a harness to collar etc.
 
Care should always be exercised when tethering a dog, to make sure the dog is safe and supervised, that pathways are not restricted by the tethered dog (not all people are comfortable near dogs) and keep in mind that an agitated dog could easily chew through any lead to escape.