EASY USE: Simply wet the wheels and run your knife through the three slots starting with the coarse wheel and finishing with the fine wheel SHARPENS ANY KNIFE: Use your Global knife sharpener on any non-serrated blade with a 15° cutting edge 3 WHEELS: For unparalleled sharpness, the Global pull-through sharpener offers fine, medium and rough stone wheels SAFE SHARPENING: The rubber base and ergonomic handle provide a secure grip preventing slips and accidents MAINTENANCE: Hand wash only. Replacement ceramic wheels available.