Looking forward to the improvements.
Amazing how our eyes deceive us too. I'd swear from the photos that the sides on the hex part are not the same length.
Good eye, they are not equal (it IS symmetrical from side to side though). Same with the Pentagon. They are simply run out to join and blend into the outside flat sides. They don't need to be equal due to the way the tool is used, it really doesn't matter, only the angles do. It would also just create a bunch of unnecessary extra work to deburr

. Plus I wanted one shared flat surface where the screw came through, and to make all shapes concentric with the center they wouldn't nest together in a nice aesthetically pleasing (to me anyway) homogenized and compact product like that.
Had to get my hightech backdrop out again for that one

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Looking at it again now, I could push the penta sides around a bit to further achieve that goal, and make the indexing flats a bit larger. I'll do it on the next ones. I seriously doubt I'll ever even use the penta side though, but it was kind of an afterthought, when I thought I could fit another set of angles in there. How many times would you need to rough index by 5? Maybe some top secret work for the US gooberment?
It makes for a better sounding name though. Like the 123 block, and the 345 triangle, this is the 456 index block.

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Some improvements would be the center hole angled faces being 60* (they're currently 77.57*). I simply just joined the 2 circles tangentially and didn't pay any mind to the actual angle because I hadn't concieved of holding hex stock with it, and it didn't really matter. Not that I probably ever would, but why exclude it? Would be fun to drill 5 indexed holes radially around hex stock. Might break the universe or something

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Fun morning project though. I need to make a point to do these more.