2 Pieces Diamond Retractable Knife Sharpener Multi-functional Portable Knife Sharpening Steel Rod Pen for Kitchen Outdoor Hunting Serrated Knife Grit Fishing Hook Sharpener Stick Tools (Sky Blue, Red)

Works well on those scallop edge knives, does a good job of sharpening.

I bought these for my boyfriend because, let’s be honest, a man with a dull knife is just a man carrying a very shiny spoon. The "Do-It-All" Rod: These things are like the MacGyver of the tool world. One minute it’s sharpening a kitchen knife on the flat side, the next it’s fixing a fish hook in that little groove (for whenever he finally goes on that fishing trip he talks about), and then—the real party trick—it has a pointed end for serrated blades or chainsaw teeth. It’s basically a diamond-encrusted magic wand for anything with an edge. The "Two-for-One" Special: It comes in a 2-pack, which is the greatest gift you can give to someone with ADHD. One for the kitchen, one for the "adventure bag." Or, in our case, one for him to use and one for him to inevitably misplace and then find three months later in a coat pocket. The Retractable Factor: They retract into themselves like a fancy pen, so they don't tear up the inside of his pockets or his new leather sheath. It’s sleek, it’s portable, and it doesn't look like a bulky industrial tool. Final Verdict: If your partner has a collection of knives that couldn't cut through warm butter, get him these. For the price, you get two "survival sticks" that make him feel like a professional woodsman every time he touches up a blade.

I have been using these for well over 25 years and they are excellent for bringing a knife edge back to life. I would never be with out one in fact I have three of them. In different locations great product.

this is a very nice tool I bought and kept one for myself how about two more and gave away his gifts.

Convenient - I always have one in my pencil cup - I now gift them to friends. I keep my pocket knives with just a few swipes on this sharpener.