This tv wall mount is an example of you get what you pay for.  It does the job and is sturdy when tightened down so the TV isn't going any where.  The problem is that the TV level is different when the wall mounts arm is extended or retracted.  If you level the TV with the arm retracted so the the TV is against the wall the TV will be slanted when you pull the arm out to full extension, and vise versa.  I ended up purchasing a Wall mount for twice the money but with non of the problems.