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. 

Apx measurements --- 3/8" Material Diameter - 2" Width - 4" Length.

Note: 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.