Hi!
The drill bits that have seen most use/ my top ten, if you want: (All original kit's content)
1. HSS D3-10 CE/10 drill bit case (I also use these for wood, a lot.) Especially 3 & 10 mm.
2. BKS D3-8 CE/W-K drill bit case (I use these with tape as "depth stop" both for pilot holes and free-hand doweling) Especially 3, 6 and 8 mm.
3. BTA HW D5 CE drill bit with depth stop (as described)
4. BSTA HS D3.5 CE drill countersink with depth stop (I use this mainly for garden projects)
5. CENTROTEC-DRIVE screwdriver handle + long bits for manual screw driving
6. QLS D5-15 CE deburring countersink
7. QLS D2-8 CE deburring countersink
8. ZB HS D5 EURO CE centering bit
9. HD D18 CE hook driver
10. BA-CE CENTROTEC drill adapter (Especially handy for use with my Hilti TE 2-M - since this drill has a 2nd gear for high(er) speed...)
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Personally I think they could have left out all of the 25 mm standard bits (except for the twinBox) and made that space more customizable. I realize there might be tradesman that go through a lot of these bits and want quick and easy access. Personally I need/want to sort/keep more different bits than 50 replacements of standard sizes. Like I said, I added the T-Star's, some 50 mm, some hex, some +- ... You get the picture. Additionally, every drill has the standard bits short/long anyway - so the chance that I run out of a standard size/profile is highly unlikely even without the original set of 50 from the kit.
In my experience people who go through a lot of bits buy exactly their sizes/profiles in bulk anyway - exceeding the storage capacity of the kit by far.
Personally, I honestly have so many bits by now... I really need to slap myself on the wrists every time the urge to buy a set overcomes me. And I have already given away plenty...
I was thinking of placing one of those bubblegum vending machines on my front porch so people who pass by can get a random bit for a penny a twist. ... Just kidding of course.
Additionally I have really awesome bits like the ones from PB Swiss for assembling furniture and other applications where some of the screw's heads are visible later on, and those last. First because they are high quality, perfectly cut, sharp & hard - and secondly I typically don't use them when I can foresee slippage because of sh*tty/cheap screws, worn heads or other sh*tty circumstances. I'd rather "kill" one of those rather soft/ more tough than hard standard bits and throw it away afterwards than foreseeable ruining excellent bits on purpose. But still, even that happens so rarely that I don't need so many of them for one project.
Kind regards,
Oliver