Spyderco's Double Stuff sharpener is a 303F and 303M bonded together and packaged in a leather pouch offering a variety of sharpening options.
This pocket stone fits in the palm and has both medium and fine grits packaged in a leather carrying case. It is autoclave safe (ideal for dental tool sharpening) or can be cleaned with a plastic scouring pad and powdered abrasive cleanser. Measures 1" X 5" X 1/8" (25mm X 127mm X 3.2mm)
Information from Spyderco
I bought the sharpener a few days ago and I’m not disappointed it’s my first wet stone type sharpener and once you learn how you can get knives razor-sharp the sheath included is a nice touch.
awsome feild sharpener
Very easy to use, and made with great materials. A perfect field sharpener. The medium side can quickly apex most tool/carbon steels, and the fine ceramic side is great for hair-popping micro-bevels. Pair this with a decent compact strop, and you have about 90% of your bases covered with respect to field and pocket knives.
I used to use this stone on a table to sharpen my knife, recently I cut a 2X4 and made a 90 degree angle, I then leaned the stone against the vertical piece of wood until I found the right angle on my spyderco delica, once I found it, I marked the wood, now I have basically a one sided spyderco sharpmaker for $30, works great
I've had one of these since 2004 and it's the best sharpener I've ever used. I can't even begin to tell you. Weird thing is, I can't even remember why I bought it. I think I was exchanging something at a knife shop and needed to fill a gap in the price difference and I grabbed it on a whim. Meanwhile, 12+ years later, best whim I ever had.