Great product, may not work for Power Cables
Crutchfield Customer Review (What's this?)
I really liked the idea, and it did work for me. But it almost didn't work for me, because I bought it to run my TV power cord thru the wall. On my LG TV the 3 prong cable that plugs into the wall is too big to fit thru here, and the end that plugs into the TV just Barely fit the this ring, it did, but I had to trim some of the plastic off of the back of the ring. But for A/V cables and HDMI should go thru no problem. So I recommend them.