DMT Credit Card Size Coarse Sharpener. OpticsPlanet Inc is an Authorized US Distributor for DMT Knife Accessories. Diasharp sharpening stones will save you time and money by quickly putting a razor edge on knives and tools. This lightweight credit card sized sharpener easily fits in a wallet or pocket for quick sharpening wherever you go. Specifications for DMT Credit Card Size Coarse Sharpener D3C: Manufacturer: DMT Included Accessories: Vinyl Sheath Blade Material: Diamond Package Contents: DMT Credit Card Size Coarse Sharpener This picture above is representative of the group of items. It may not match the exact item that you are looking at. Please make sure to read the description of the individual item. We offer complete line of DMT Knife Accessories. For our complete selection of products by DMT on sale please visit our DMT page. For more Knife Accessories please visit our Knife Accessories store section. DMT Credit Card Size Coarse Sharpener D3C