Spyderco Tri-Angle Sharpmaker Diamond Sharpener - Set of 2 (Diamond Coarse) 204D

First off let me say, if you're having trouble getting these or the boron nitride stones in your base, you're probably trying to insert them upside down. The UNCOATED ends go into the base, they fit as well as the medium and fine stones. As for the stone performance, they work as advertised and are just the ticket for fast material removal on S _ _V(n) series steels and the super tough tool steel blades. The tricky part is trying to keep the passes as light as possible, it doesn't take much pressure to be effective and too much will pull the diamonds out of the nickle matrix. Once I got these stones the edges on my S35VN Sebenza finally got to the sharpness I was looking for.

If you’re buying knives with steels that aren’t S30V or better you don’t need these. The regular Medium and Fine stones will work fine. If you’re a knife snob that has the best steels, then this is a must have. My Sage 1 came with a janky edge and I couldn’t fix it until I got the diamond stones. Don’t press too hard, take your time they work like magic.

I couldn't do without these. I have had a pair for many years now and they're starting to wear out so I'm asking for new ones for Christmas. To use them correctly don't press too hard. Let the stones do the work and they will last a long time. i usually get mine wet before using but I don't think you have to. I use them for knives that are really dull to get the beveled edge back before going to the coarse and fine stones. I also have a set of the extra fine.