Medium Grit Diamond Stone. Good to use on a bench/table. It has a hard plastic case of which it is a part. It's actually part of the lid. After taking it apart, turn the lid upside down and it will fit into the base of the case/box. The case has rubber feet to keep it in place. Mine had holes you could put the stone in if you wanted it to be in a fixed place and sure it wouldn't move. I have this and a thin stone and they both cut well dry or with water when I don't feel like taking out smith stones and messing with oil.