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Spyderco Ultra Fine Triangle Stone

4.7 out of 5 stars 265 customer reviews
| 14 answered questions
List Price: $23.95
Price: $14.79 & FREE Shipping on orders over $49. Details
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  • Made using the highest quality materials
  • Tested for quality and durability
  • The most trusted name in you cutlery needs
  • Ultra-Fine ceramic triangular rods for the Spyderco Sharpmaker sharpening system
  • Designed for professional-grade finishing and polishing of sharpened edges for maximum sharpness
  • Sharpen all types of edges including serrated edges
  • Sold individually
  • Made in USA
79 new from $14.79 1 used from $8.00
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Total price: $63.84
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Product Details

  • Product Dimensions: 7 x 0.5 x 0.5 inches ; 3.2 ounces
  • Shipping Weight: 1 pounds (View shipping rates and policies)
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • Origin: USA
  • ASIN: B0019JTNDQ
  • Item model number: 204UF1
  • Average Customer Review: 4.7 out of 5 stars  See all reviews (265 customer reviews)
  • Amazon Best Sellers Rank: #6,137 in Sports & Outdoors (See Top 100 in Sports & Outdoors)
  • Discontinued by manufacturer: Yes

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Customer Reviews

Top Customer Reviews

5.0 out of 5 starsGet over it people, READ the specs! A FINE product.
By John Morgan on July 12, 2010
I own the Spyderco system, and I think it's about the all-around best sharpening system going. Easy to use, not at all messy as it requires no sharpening oil, and will truly get a knife (or other cutting tool, very versatile sharpener!)shaving sharp.

I know many reviewers of the ultra-fine stone are complaining that "they only got one stone." Jeesh! READ the specs! The catalog clearly, clearly states that they are sold INDIVIDUALLY. "Individually" signifies "one by itself", folks.

Now, for an actual review of the ultra-fine stone itself... (how's that for new and different, huh?)

The UF stone works exactly as advertised. It will put an unbelievably sharp edge on your blade! Now understand, with just the medium and fine stones included with the Sharpmaker, you can get a blade sharp enough to shave hair. However, this UF stone takes that sharpness to the next level, resulting in a blade that can be very lightly slid along your arm with next-to-no pressure at all and the hair just flies right off. It will, with just a couple of strokes, take a sharp blade to the "Samurai test" state of sharpness... putting the blade against the hair at the back of your head and attempting to move it down. If it catches and doesn't move, it's sharp!

I'd say these stones are a worthwhile purchase IF you're only satisfied with the sharpest possible edge on your knives. Like me, obviously, since I bought them and love them!
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5.0 out of 5 starsAwesome product NEXT LEVEL ON THE SHARPMAKER BUY TWO!!!!!
By Rich on March 17, 2011
Verified Purchase
As long as you have a 204 sharpmaker this is a must have add on to an already great set. After the fine stone you can move over to the puppy and really take that blade to the next level. If you are working on CPM m4 or ZDP 189 make sure that the edge highly refined on the previous stones or you will get nothing the stone doesn't have enough bite to really affect the bevels of steel in that hardness range, but that should be a given since it is an Ultra fine stone. This stone with minimal effort can put a near mirror like finish on my ZDP delica in 5 mins on the 30 degree side(after the bevel is set with the lower grit stones) It also makes quick work on the 40 degree side of taking a pretty sharp knife and taking it to the next level(for edc blades). Even being as great as it is, i still do see minor edge improvement after some very light stropping on 3 micron chromium oxide(this may be a fault in my technique on the sharpmaker) All in all I find myself using the sharpmaker even more than my whetstones since i added this to my collection. Also it allows me to hit the edge on recurved blades(ie: kershaw shallot) with a high grit ceramic that is fixed in place rather than held in had like most are. Giving me much better control over the edge geometry.
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5.0 out of 5 starsPlease Disregard The 1 Star Ratings
By Crash Nut 9 on August 27, 2010
Verified Purchase
If you have the spyderco sharpmaker system and are one of those people who absolutely needs to have the sharpest knife around, this is the final piece. My knives were already sharp enough to cut a piece of paper width wise, so knowing that there was something out there that could make the blade even sharper... well that was just too much to be able to resist. To be honest, it's not a drastic increase in sharpness, but it's definitely noticeable. Buy two quantities for a complete set.

The the first couple reviewers- if you'd done any shopping around at all for these stones, you'd realize that $15 is about the going rate for 1 stone, not the set.
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5.0 out of 5 starsPurchase 2 of these for your Sharpmaker kit
By Gearhead Mania TOP 1000 REVIEWER on March 4, 2011
Verified Purchase
Spyderco Ultra Fine Triangle Stone

Although the actual "grit" equivalency for the Ultra Fine stones are hotly debated, I couldn't tell a significant difference from touch versus the Spyderco Fine triangle stones that are included in the Triangle Sharpmaker kit. That said, when using the stones, the Ultra Fine does seem to be smoother to the touch of a blade versus the Fine stones. I couldn't really find an instruction set for the Ultra Fine stones, so I used them as a "third stage" with the medium and fine grit stones that are included in the Sharpmaker kit.

First off is the quantity. The stones are sold individually, so one must purchase 2 of the stones for each Sharpmaker kit. They are shipped in a clear tube to prevent damage. I noticed that my stones came with small chips which could be felt with a blade as I used them. I scrubbed the two stones together to smooth it out and it seems to have helped. These are extremely hard ceramic stones with an equivalent grit of at least 2000 or higher. They are very easy to use with the Sharpmaker kit and will give that razor-like edge to most blades.

I used the Ultra Fine to put the finishing touches on a Spyderco Tenacious, a meat cleaver, pocket knife, and a letter opener. The Sharpmaker kit worked well enough on its own, but the Ultra Fine put that extra fine razor edge on the blades. Some people may not care about this part, so the standard Sharpmaker kit should suffice for most users.

Overall: 5/5 stars, works as advertised, but not quite mandatory for everyone.
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3.0 out of 5 starsNot sure if it's me or the sharpener
By TylerDC on August 1, 2012
Verified Purchase
Been using the ultra fine ceramics (got 2) for about a week now. I've touched up all my backpacking knives and I'm really not impressed at all. I've taken it from the medium to the fine, and it was able to slice paper very well and would shave arm hairs with little effort. After using the ultra fine, it it noticeably less effective at slicing paper and takes multiple strokes to remove arm hair when it only took one after using the fine.

I am fairly certain I am using it correctly. I use less than the weight of the blade and just do 5-6 strokes on each side, going back and forth. Other than pressure, I don't change my technique from the fine to the ultra fine, but somehow my blade appears more dull. I had went back and forth several times between the fine and ultra fine, and every time it is much sharper after using the fine. any tips will be appreciated, but until I can bring the blade sharper than the normal "fine" I am sticking to my 2 star rating.

For reference, I have tested the rod on 6 knives with equivalent results. Spyderco endura 4, Mora #1, Spyderco bushcraftuk, cold steel SRK san mai iii, leatherman Juice s2, Leatherman Surge. i never used the same edge of the stone more than once, and would clean it with dawn dish soap and water between knives. Each time it seemed sharper with the fine stone than it did with the utra fine. so it seems that I am using it correctly if I can get it shaving sharp on the fine in the first place.

EDIT: I changed my review to 3 starts, because logically I am at fault, not the product. I still don't think it should have higher than a 3 star review, simply because I can get my knives sharper using an ultra fine bench stone. I love the spyderco sharpmaker system!Read more ›
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Most Recent Customer Reviews

5.0 out of 5 starsFive Stars

Works perfectly.

Published 10 days ago by Teo Rains
3.0 out of 5 starsThree Stars

Pity I found out it is a single stick not pair only upon arrival. Otherwise does its job.

Published 12 days ago by John Basil
4.0 out of 5 starsI could not tell the difference between the edge from the standard...

First time user, I could not tell the difference between the edge from the standard stones and these ultra fine ones.

Published 13 days ago by steve pacitto
3.0 out of 5 starsDon't think it's super useful, more aesthetic than practical need

Don't think it's super useful, more aesthetic than practical need, also be sure to have the edge perfectly profiled and smoothen with the normal process, as this will only polish... Read more

Published 13 days ago by Lucas Collino
5.0 out of 5 starsWorth it if you decide to buy it

These stones are sold individually so make sure to purchase two of these to make sharpening easier.

The ultrafine stones look identical to the ceramic stones that come... Read more

Published 26 days ago by Joshua Oh
5.0 out of 5 starsFirst Responder highly recommends this as economical, easy, great...

Tried a lot of sharpening tools; an expert recommended this over a power wheel, and my family said I made the kitchen knives too sharp. Read more

Published 26 days ago by Dave S
5.0 out of 5 starsHair popping sharp

Got a pair of these for myself and a pair for my brother after seeing what they could do.

They brought my knife (Ken Onion Leek) from very sharp to razor sharp. Read more

Published 1 month ago by Albert Filice
3.0 out of 5 starsThree Stars

And yes... I would buy it again.

Published 1 month ago by Scott
5.0 out of 5 starsOnly one is needed for me.

As described only one is sold.. you have to choose two to purchase if you want to have two stones. I am ok with the one.. Read more

Published 1 month ago by DelKar
5.0 out of 5 starsFive Stars

If you're looking for next level sharpness... you found it. Wicked sharp!

Published 1 month ago by Paul Abernathy

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