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where to buy unusual bits? I already have all the common ones but I want a separate set for all the weird/uncommon ones
(upload.wikimedia.org)
Picture is just for illustrative purposes. I live in Europe.
Since everyone isn't catching this:
That means no Harbor Freight, Home Depot, Lowe's, etc
The ones with holes are commonly called security bits. More comprehensive sets are available with all kinds of unusual bits, some having more than the one pictured.
These sets aren't that common in your regular home center or hardware store, but they should be easy to find online.