Use the OXO Good Grips Chopper to manually chop vegetables and nuts. Use the chopper with the included chopping cup or directly on a cutting board or other kitchen surface. As you push on the knob, the blades rotate to chop evenly, as coarse or as fine as you like. An inner bumper absorbs shock as you chop. Remove the blade cartridge for cleaning, and lock the knob in place for storage. Dishwasher safe.