These 6" x 2" workhorse stones are fine for plane irons, chisels, knives & carving tools. At 3/4" thick, stones can be hand held for sharpening large tools such as drawknives. Each comes with a snap-on plastic base with non-skid feet; keyholes in the base let you clip it onto a couple of screws at a sharpening workstation. A clear plastic dust cover is included.