Review on Medium Grade Atoma Diamond Sharpener - #400 by Billy Mariner

The Atoma 400 diamond blade is good for dressing 500+ grit whetstones and can also be used as a coarse sharpening plate for knife repairs to serve. Very high quality plate. I like to use an Atoma 400 plate on my Shapton 1000 or higher stones to avoid scratching them too much. 400 is also less aggressive and wears out the stone less. If you're leveling rocks that are less than 500 grit or need to do a major repair on a chipped knife, I'd go with the Atoma 140 instead. Knife. I still prefer the feel of the stones when sharpening knives, but overall the coarse grit doesn't make a good impression.