Peerless, the manufacturer of this product, indicates in their specs that it is Vesa 200x200 compatible, but then include only 6mm mounting screws that go into the back of the TV. Some Samsung LED TVs require 8mm screws!!  When you call Peerless they tell you your new TV is NOT compatible!  I insisted that they send me 8mm screws - after considerable pushing, they finally did - and then I drilled out (enlarged) the holes in the mounting plate to fit.  All of this was after I had already pointed out to them that SA740 mount originally sent - PER THEIR SPECS - did not fit their IB40 box! They finally sent the PA740 mount and now have changed their specs. This IS a great mounting system... the three stars are because the ONE MAIN JOB Peerless has - i.e. to mount TO OTHER THINGS (WALL AND TV) - they have trouble getting right!