Diamond Machining Technology is the most important manufacturer of diamond stones in the world. As the name implies, DMT® focuses all of there efforts specifically on diamond sharpening technologies. All DMT® products are made in the USA, in New England. Recommending what is the best approach for sharpening is about as controversial as talking politics, but if you have decided that diamond sharpening is what you prefer, we can assure you that there are no better quality diamond sharpening products than those made by DMT®