This is the 0.050 micron polycrystalline product. Two times finer than tenth micron and 5 times finer than quarter micron. It is also the same as 50 nanometers or 320,000 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 polycrystalline products are the highest quality and concentration available and guaranteed 100% polycrystalline.diamond - accurately sized for particle size..