What type of tool do I need for this screw holding my license plate?
This is secure hex bit or similar. There are a bunch of varieties. The basic idea is to take a "normal" head (e.g., a standard hex or Torx) and add something to prevent the regular bits from working. It is of limited use as far as real security because the bits are usually not hard to find. For example, this set from Harbor Freight or this set from Home Depot. Search for "security bit" or "tamper proof bit" or similar.
1The tamper sets are handy and not very expensive, if short on funds see isherwoods answer.+– Ed BealNov 26, 2018 at 19:40
If license plate theft isn't a concern where you are, simply break out that pin. Use a needle-nose plier, small flat screwdriver, or something similar and bend it back and forth a couple times. It'll fatigue and fall off, and you can use a standard allen key.
I break them all the time even though I have a tamper proof bit set, some times just quicker than finding the right tool.+– Ed BealNov 26, 2018 at 19:39
1You can also use a small nail set. Put the nail set sideways against the nub and tap with a hammer. Nov 27, 2018 at 3:36
You need a TX Torx bit or screwdriver Ordinary torx bits are numbered T10, T20 T30 Etc. However you need the TX as in TX10 Tx20 Tx30 You can usually buy them all as one set.
2That looks more like a hex than a Torx to me. However, there are plenty of bit sets that include both types. Nov 26, 2018 at 21:07