This is the 0.025 micron polycrystalline product. Four times finer than tenth micron and ten times finer than quarter micron, it is also the same as 25 nanometers or 640,000 grit!
Polycrystalline diamond is more expensive than monocrystalline. It is more friable and has more cutting surfaces than mono. It's main disadvantage is cost, but in many applications it is advantageous in giving the finest level of finish possible, especially in these ultra fine grits.
All of these polycrystaline products are the highest quality and concentration available and guaranteed 100% polycrystaline.diamond - accurately sized for particle size..
This poly 0.25 diamond has quickly become my favorite finisher for high carbon knifes.
It works well on both balsa & leather.
On an all-ready sharp knife it quickly takes an edge from "very sharp" to "screaming scary sharp"
And it’s fast enough to serve a good purpose on a "touch-up strop" in keep in the kitchen for a quick sharpening before attacking the veggies!
This grit seems to work on any steel. I have white#2 steel from Tojiro ITK series which takes the higheest edge,white#1 next highest,Aogami Super Steel,and Shun Vg10,and Sg2. They are all upgraded markedly in sharpness by this grit over the .5 and .1 micron sprays. This spray takes them from able to push cut,to easily able to push cut a few inches from the fingers,especially the cheap tojiro White#2 steel knives. What’s more,the cutting is whisper quiet. I put some on magnet strip balsa wood bought here,and put on refrigerator like any other magnet. I just walk over and wipe knife once or twice on each side against it,that’s how to keep them razory sharp. If they get beyond that,I use 10000 stone and .5,.1 micron boron sprays on balsa,then this stuff. You gotta try this. It is worth a lot of stropping all in one or two strokes. Real time-saver,and in some cases will do what other methods will not even get to on a given steel,especially the harder one and the more alloyed stainless-like ones.