What is the proper tool to unscrew this type of screw?

score:6

Accepted answer

This appears to be a "H-Type (notched spanner)" screw from the description below (second row from the top, second column from the right):

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You will need a H-type screw driver:

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Upvote:3

It's a fairly common form of "tamper proof" head, you need a bit that looks like a regular flat blade but with a slot in the middle. I think it's sometimes called a "spanner head". In my experience most "security bit sets" contain that style of bit in a variety of sizes.

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