I had been Purchasing Mills, as I needed them, and i finally bought this set, since the Price was Right.
All the Mills have a 3/8" Body. On the Good Side, this means Changing Mills does not require Changing Collets. You can leave in the 3/8 Collet, when Swapping mills, saving a bit of time. The Only Bad Side is that because the Shank is 3/8, on Mills Smaller than 3/8", you cannot make cuts deeper than the Length of Cut, even with Multiple Passes. I don't see that as a problem, since the LOC is Appropriate for most Purposes, and 3/8" is the Size I use for most often.