When I first saw it I thought it was quite a fancy and original design. Conclusion after use: A good idea went completely wrong. 1) It's difficult, if not impossible, to get a tight fit on sandpaper. 2) If you try to sand two pieces of wood attached at a 90 degree angle, the unsanded one will end up with black spots running parallel to the sanded edge. I applaud the tire recycling effort, but this particular application is poorly thought out. I am really surprised that this product made it to market. This begs the question: has this ever been tested? Another item at the landfill.