Something so simple really screws this item. Unless you have an abnormally high ceilings in your garage which most people do not, you will not be able to point (aim) the 2 lasers at your cars because they will not spread wide enough. A ridiculous flaw. I had to use a sharp blade to cut the plastic "rim" that restricts the motion of each arm. Tricky b/c of you are cutting plastic in a small awkward area. Yes, I cut my finger. You"ll know what I mean when you see it. Good luck.Other than this, once you can use it, it works great.