This product is a set of inner wire pliers for bicycles. They can effortlessly grasp and pull the inner cables of the brake and derailleur and tense them to facilitate your maintenance tasks.
They can remove the sag of wires by simply squeezing their handles, so you can tighten a pinch-bolt without being disturbed by wires.
Although it is not included in their intended design, you can also use this tool for pulling tie-wraps (note that it cannot grip and pull all types of tie-wraps).