If you need to maintain small edges or pointed tools, or portability or space is of concern, DMT offers a continuous diamond surface stones!Take your sharpening anywhere with the ready-to-go Dia-Sharp credit card sized diamond sharpener. Fits easily in pocket or wallet. Comes in convenient vinyl color-coded carry case. Offered in coarse, fine and extra-fine diamond grits.Pocket-sized convenienceThree different diamond stones: Extra-Fine to polish and refine an edge, Fine for a razor sharp edge and Coarse to transform a dull edgeSharpens knives faster than conventional stones with DMT’s micronized monocrystalline diamond surfaceNo oil is needed-sharpen dry or with waterDurable 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.