I've had some requests for larger diamond plates, so I've added these. I think they are overkill for most knives. But I have to admit that they are faster, especially when you are removing a lot of metal to establish an initial edge, or restore an abused knife. If you are going to sharpen chisels, plane blades, etc., they are almost a necessity. These are good ones, 6" long, 2" wide, and 1/4" thick to eliminate any chance of flex. There are several grits available, In the DMT brand I have Extra Fine (1200 mesh, 9 micron), Fine (600 mesh, 25 micron), Coarse (325 mesh, 45 micron). They come with rubber feet to help hold them still on the bench, but I have better luck with something more positive like a vise. At events I sometimes position one on the corner of my table with wood screws. If you are only going to get one, I think the fine grade is the most useful. If you are going to get one to go with a smaller plate, the coarse might be better. If you need to go to a bench plate you probably have some heavy duty stock removal in mind. Made in the USA.