I tinker mechanics and I thought that this tool would help me in difficult situations just like my old ice cutting mirror. What was my disappointment when I mounted the ice on its telescopic arm, it was not threaded, I had to do it myself. I will make me two other flexible sleeves to prevent having to unscrew a to mount another. At the same time for the price ... but the tool is not practical it imposes a straight line access which is not always possible. Ball joints are of poor quality it unlocked all the time and their locking is impossible. The positive point is that the magnifying mirrors are (barely visible). I do not advise.