The 5" stone polishing set is a great way the professional to start off, at an good price. The kit allows you to manipulate the edges of stone such as smoothing off burrs and rough edges. Start off with the 100 grit pad, and work your way to the 800 grit pad for a polished surface. This kit is also perfect for removing stains from expensive marble and travertine stones, while set in place. The larger diameter allows for faster job times, and will last longer than the smaller sizes.