What is this screw head?

[hemmjo]

What is this screw head called? Was able to remove them using a #2 ECX screw driver bit, but that only engaged 2 of the slots. Never saw this before.

[Frank S]

It is called a vega double square or 8 point star bit some trailer manufactures use them in an effort to make their products Pro priority items. It is also said that the drive bits hold the screws better for production runs

[hemmjo]

I work on trailers, and have bits for this kind of double square,



But they do not fit this head correctly

[Frank S]

Found it
headloc spider bit