Staples can be used for a variety of zip line applications. If you intend to wrap a cable directly around an anchor point, using a staple is a good way to keep the cable from moving vertically up or down. The longer 8" staples make excellent footholds when driven into a tree or pole; especially when the use of a ladder isn't a viable option.
Note: you should never use a staple in an application where the staple is a critical component (i.e. if the staple were to pull out the entire system would be compromised). For critical terminations we recommend using cable slings or eyebolts.