Available in Medium (pictured), Fine or Ultrafine grits, each 2" x 8" x 1/5" stone comes packaged in a rigid polymer storage case complete with non-skid rubber feet for tabletop use. Quantity . Made from ultra-hard alumina ceramic material, Spyderco's ultra-fine-grit benchstone is used like a traditional sharpening stone, but does not require oil or water. It comes with a protective suede carry case that doubles as a non-slip base during use. Free shipping for many products! Spyderco’s medium-grit (brown) ceramic pocket stone is compact, lightweight, and ideal for touching up edges in the field. Find many great new & used options and get the best deals for Spyderco Ceramic Bench Stone Medium Grit Sharpener 302M at the best online prices at eBay! Description . Technical Specs . Pocket Stone Medium 1X5 . As with all of Spyderco's ceramic stones, use our benchstones dry without lubricants or oils.