Keeps diamond and stone cutters clean to maximize life. How to clean a bur, plunge bur into cleaning stone for just at instant normal carving speed. This removes debris from diamond and stone burs and restores the cutting edges of diamond particles. For best results, moisten cleaning stone to clean more efficiently. The cleaning stone measures in inches: 3 by ³/₄ by ³/₄. Note, carver shown in the photo is not included with the bur cleaning stone.