If you look through my home cinema story you'll see that the ceiling of my home cinema is the floor of the garage above. It's hollow reinforced concrete and I've had to drill umpteen holes into it. 7 speakers with 4 holes each, for example. I used a standard black+decker drill and masonry drill bits and would be pushing the thing into the ceiling for hours doing millimeters at a go. Nighmare understates the job. I sold my old screen Saturday night so we were putting up my new screen yesterday during a party so we could put a movie on. Sods law disctates that none of the old holes were usable so 4 new holes needed. Plenty of help from people to drill the holes, hold the vacuum next to the drill etc. But as usual we were really struggling. The second hole was not getting more than an inch deep despite mighty efforts. Then another brother-in-law arrived any by pure chance they had a pneumatic drill with them. What the hell is a pneumatic drill?!!! Oh it'll go through your ceiling as if it were butter. ******** !! I thought. But it did, you know. Whoosh. Straight up and we had the difficult hole and two more drilled in a matter of seconds. The drill they bought cost £300, but you can get cheaper alternatives for the occasional difficult drilling. Check out this page for a similar drill for £25 !! I wish I'd known about this when I put my speakers up. It would have saved me hours.