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I have a screwdriver which uses interchangeable bits and a magnet to hold them in place. The screwdriver takes 4mm hex shank sized bits. It seems this shank size is really rare, because I can't find any security bits with a shank of this size. Everywhere I look I see 1/4" hex shanks. So, I am wondering if there is an adapter that exists which converts 1/4" hex shanks down to a 4mm size so they can fit my screwdriver. I have seen a number of products which do the opposite, allowing screwdrivers/drills which take 1/4" shanks to use bits with 4mm shanks, but I haven't found any adapters which upscale the shank size I can use.

The closest thing I can find to what I am looking for is this product, but it adapts a 4mm hex shank to a larger square socket

Why is this? Where can I find an adapter that I need? I would actually prefer to just find a pack of security bits which use 4mm hex shanks so I don't need an adapter, but I don't think they exist.

ExecutionByFork
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  • Did you search with term micro or mini hex as a term? That is the more common name for 4mm drive bits. Also, do you know what T size you need for your security bits? – UnhandledExcepSean Feb 19 '20 at 18:51
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    Might be easier to go the other way and find yourself a 1/4 drive magnetic screwdriver and buy something like this https://www.kctoolco.com/wiha-75802-1-4-insert-bit-to-system-4-micro-bit-adaptor-magnetic/ to allow your 1/4" drivers to accept 4mm bits – UnhandledExcepSean Feb 19 '20 at 18:57
  • Oh and one last clarification, you do mean TORX security bits when you say security bits. right? – UnhandledExcepSean Feb 19 '20 at 19:02
  • Sorry for the late response. My purpose for buying security bits is so I can open up my SCUF controller, and specifically I know that I can use a spanner bit for this. Though, I would like to just buy a set of security bits so I can use them for other things in the future if I need them (so Torx, Star, Tri Wing, etc is all within scope). Unfortunately the term "mini hex" doesn't seem to be bringing up any useful results. I was hoping to use my current screwdriver because it's actually pretty nice with a ratchet and stuff, but I may just have to buy one that takes 1/4" bits... – ExecutionByFork Feb 23 '20 at 22:31

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