Two-stage ceramic disc knife sharpener for straight-edged, metal-bladed knives; not suitable for serrated or ceramic knives, nor for scissors. At the front of the body is a push-button, two-position rocker switch labeled I (pre-grinding) and II (precision-grinding). Always clean both the knife and the sharpener thoroughly before sharpening. Suitable for both left- and right-handed users. When the knife is very dull, press the switch to position I (pre grinding), insert the heel of the blade into the slot, and pull the blade lightly from heel to tip, through the guide. Repeat 3–4 times. With each pull, a small amount of material is removed—the blade becomes coarsely ground. Next, finish the edge. Press the switch to position II (precision grinding), allowing the discs to rotate freely. Pull the blade lightly from heel to tip 3–4 times to hone the edge. The precision grinding (II) stage may be used, for instance, on a daily basis to keep the blade razor sharp with minimal wear. If the blade no longer achieves a razor edge in stage II, begin again with stage I, then finish with stage II.
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