Developed for smoothing chipped edges of fine crystal, china, ceramic, glassware or any hard material to nearly new. A unique product which answers a problem found in virtually every home. Coarse diamond to quickly restore a chipped edge. This half-round sharpener can also be used to restore any flat or curved edge.Easily smoothes chipped edges of crystal, china, ceramic, glassware or any hard materialCoarse diamond to transform a dull edgeCompact, lightweightHalf-round coarse diamond file good for all-purpose filing needsDurable construction will provide years of performance and reliable serviceWARNING: use of this product can expose you to chemicals including nickel which is known to the State of California to cause cancer. For more information go to www.p65warnings.ca.gov.