Great for woodworkers machinists and home hobbyists, these stones offer a traditional shape to effectively hone wider tools such as plane irons, chisels, and large blades. Using the medium grit stone first, then the fine grit, then the ultra-fine grit, these stones complement each other to create a razor-sharp edge. As with Spyderco's other ceramics, the stones in the 302 series require no water or oil for use. Each comes in a heavy-duty ABS box and can be used in or out of its box (the box has a lid and non-skid rubber disks on the bottom to prevent slipping during use). 302UF: Stone Size: 2" x 8" x 1/2", Type of Case : ABS Box. Ultra-Fine Grit