The Piranha Sharpening Stone is one of the most important items on our Product line, as it is essential to maintaining the lifespan and cutting quality of diamond tools that cut any form of Porcelain or Ultra Compact Materials. When your Diamond Blade, Coring Bit, or Grinding Cup experiences a drop off in cutting performance, it is often not a case of a dead segment, but is a result of a dull segment. HOW TO USE: When your diamond product experiences a drop off in cutting quality, follow these steps. 1) Reduce the RPM of your Tool to half the speed. 2) Pass your segment through the Sharpening Stone a minimum of two times. (For Blades, slowly Use the Short Length across the width of the Stone) 3) For Wet USE ONLY items, use water when sharpening your Diamond Segment. For Dry & Wet USE items, sharpen your Diamond Segments Dry. 4) Do NOT USE the Sharpening Stone on Electroplated or Vacuum Brazed Diamond Segments. 5) Once your segment is sharpened, test the item on a small portion of the working material until you are satisfied with the segment restoration.