These are small pliers called flush cutters. These are a MUST HAVE if you are planning on using zip ties, ever. 

The problem with zip ties is when you cut them with a pair of crimpers or strippers, they usually leave a little sharp end that is sure to cause some damage so someones hand who ever has to work on the car in the future. Including your own hands!!

When you use a flush cutter on the back of a zip tie it will cut it perfectly flush leaving a clean and professional looking cut zip tie. 

Whether you are a professional or an amatuer, this tool will help you make your installs look cleaner and more professional.