The Shapton set <link>
you are referring to includes the Generic 123 plate <link>
. Whereas the DMT <link>
plate you thought was included is a higher quality plate (i.e., flat to more exacting specs & higher quantity/quality diamond particles & adhesive) that can be used to sharpen knives as well as lap stones. Another available lapping plate option that is a slight upgrade from the DMT's are the Atoma's <link>
. After using one, you really recognize their proprietary diamond particle orientation's benefits, and they are reference plate flat which is most important in its knife sharpening capacity.
If you're bent on Shapton, the set you refer to earlier includes the 1k & 4K so one more stone is the question? If you're now looking at the other Shapton sets, that opens up a lot of options. I can't speak about the Glass Stones; I've never used them & honestly have no interest in them as they're too hard for my likes. The glass sets I'd personally be apt to go for the 500/1k/6k just because the 6k is all you need, but I still don't like any of those glass progressions although that is based off logic that may not apply as like I said, I have never used the Glass stones. I like the 320/1k/5k Pro set the best of the sets with the 1k/5k/8k Pro set, next. I have Shapton Pro 2k/5k/8k/15k that I use mostly for my straight razors. Ultimately, if I was forced to buy only three Shaptons, just for knives, it would be the Pro 1k/2k/5k.