Shapton Glass Stone 500 Grit/29.4 Micron for Edge Pro. The Shapton Glass stones are a perfect match for the Edge Pro. They're slow wearing, splash-and-go stones that cut a wide variety of steels and polish very well. They also come in an unmatched variety of grits. We highly recommend this line for use on the Edge Pro. Each stone is factory cut to about 6.5mm thick which is almost twice the thickness of our Chosera stones.