blades were to dull to get threw the window glue one star works great a year later and my repair is still working great i would recommend this set to anybody that needed to do a good stuff five stars it worked until it didnt but was good enough for one job junk it works but it easily damages the windshield being cut out the tool did do the job without any problems five stars easy fix for a spark plugs that would rather be a rocket five stars replaced a blown spark plug easily definitely passed the test