This product will NOT fit most 46" TVs. Get the larger 650. The brackets that mount to the back of the tv are only about 8 inches long. I checked on the Peerless site for compatability and it said it would fit my 46" Sharp Aquos. Not true. The hole spacing on this tv is 15.75". I called Peerless tech support and they were most helpful. They asked me to send a photo of the back of my tv and they then admitted that I was indeed correct. They had me return the 640 mount to them and shipped me a 650 mount. All this at no charge. I told them I had purchased the mount online and not directly from them. They said, "No problem. It was our mistake and we will make it right.[...]the tv was on the wall in 10 minutes. I definitely recommend the 650 for larger sets. The 640 should work fine if your hole spacing is less than 8".