Atoma Diamond Plate Knife Sharpening Flattening Whetstone Replacement Blade #400

I think this is the 400. Also with the Atoma stones, you can also buy a replacement blade and stick it onto the other side to make a dual grit stone. I made a 400/1200 combo Atoma by sticking a replacement 400 blade onto the backside of my Atoma 1200.