Been a custom fabricator for 30plus years.
Every new guy starts off with a complete set of number, letter and fraction bits in a long metal box.
Guaranteed in a few years that same guy is missing the E (.250) the 7, 21, and a few other of the common tap and clearance hole bits.
Usually they will have litle bulk pack engel elopes of these sizes in the drawer. Use them till they are dull and toss them.
Then the never go back to the set unless they run out and can substitute the next size till they reorder.
Specialty bits are best used in controlled production environments with the proper coolants, spindle speeds and feed rates.
Using good old HSS bits, either you get the feel for them quickly, or you get frustrated and stop doing your own work.
Just MHO
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