They worked better than I expected. We recently had new flooring and the installers said they would not move the pool tables. After a little research, weight estimation, and planning, these retractable casters made it easy to move my 8 foot pool table around the room. I used 4 1/4"x 2" screws for the 4 outer holes to support the extra weight and 2 included screws for the center attachment of each bracket. Even the floorers said they'd never seen anything like it and were happy to carry it around the room while the new floor was laid. Great product and they work fantastic!