This is a replacement wheel for the Paper Wheels Sharpening System. It's an 8" x 3/4"wheel, slotted to avoid overheating the edges of your tools. It's designed for the final step in the sharpening process. Use a buffing compound or jeweler's rouge to lubricate and coat the wheel before polishing. It is to be used on a 6" grinder or buffer in conjunction with the gritted wheel to quickly and efficiently sharpen knives and tools.