UltraSource Three-Stone Sharpening System, 11.5" Self-contained bench sharpening unit with reservoir for oil and rotating axis that holds three stones in place for repeated use Includes three sharpening stones: 100-grit silicon carbide stone for repairing, 150-grit silicon carbide for sharpening and maintaining, and 320-grit aluminum oxide for honing cutting edges Includes bottle of honing oil to get started Durable plastic case has a lid and no-slip rubber feet, and protects stones against breakage A must have for butchers, food/meat processors, fisherman, and other jobs that require constant resharpening