What does it sharpen?
Stainless steel straight-edge knives, like chef's knives, slicing knives, cleavers and utility knives, plus kitchen scissors. It does not sharpen serrated knives (like bread knives) or ceramic blades.
Can I use it on expensive or Japanese knives?
It's designed for everyday kitchen knives. For high-end Japanese knives, very hard steel or heirloom blades, we recommend a professional sharpening service.
Do I need to use every slot?
No. Most everyday knives only need a few passes through the fine slot to refine the edge. Use the coarse slot only for knives that are truly dull or nicked, and the polishing slot for a smooth final finish. Starting with the gentlest slot that works keeps more steel on your knife.
How do I use it?
Plug the USB cord into a wall adapter and flip the switch on. Hold the sharpener steady with one hand, and with the other pull the knife slowly through the slot you need, from heel to tip, a few passes at a time. No pressing needed.
Is it safe to use?
Yes, when used as directed. Keep the sharpener on a flat, dry surface, hold it by its body away from the slots, and pull the blade through smoothly without forcing it. Remember that a freshly sharpened knife cuts more easily than before, so handle it with extra care. It's for adult use only and should be kept away from children. Knives are sharp tools, and Kolveth is not responsible for injuries or damage caused by misuse or by not following the instructions.
How is it powered?
It has a USB cord that plugs into any USB wall adapter, like the one you use for your phone.
How do I clean it?
Sharpening leaves fine metal dust inside the slots. Every few uses, switch it off and unplug it, then tip it over a trash can and tap out the dust, or sweep the slots with a small dry brush. Don't rinse it with water.
How often should I sharpen?
For most home cooks, a quick touch-up every few weeks, or whenever the knife starts slipping on tomato skin.
How long does shipping take?
Orders ship free with tracking from our US warehouse and usually arrive in 4 to 10 business days.
What if I don't like it?
You have 30 days from delivery to request a refund. If it arrives damaged or stops working, we'll replace it or refund you, and you won't pay for return shipping. For change-of-mind returns, the item should be unused and in its original packaging, and return shipping is paid by you. See our shipping and returns policy for full details.
How do I reach you?
Email support@kolveth.com or use our contact form. We reply within 1 to 2 business days.