Gatco Sharpeners Edgemate Ultimate Diamond Knife Sharpening System, Gray is a part of the high quality and dependable Knife Accessories from Gatco Sharpeners. All of the features you need for a price you want. Knife Accessories from Gatco Sharpeners are well known for their quality and Gatco Sharpeners Edgemate Ultimate Diamond Knife Sharpening System, Gray upholds that standard.