SCREWS????

[grumpy0374]

What you have there is called a double square screw or bolt head, and takes a special double square bit. There's really nothing else that will fit that particular head.
I worked at Lowes, and did carry 2 sizes of those bits in the hardware dept, Used to drive some specialty exterior screws we carried, made by FastenMaster.
Not there anymore, and I don't remember the sizes they were available in.
Check Ace or TrueValue--they may carry them.
Grumpy

[OldCoot]

You can very carefully grind down the end of a #2 square driver until it fits this screw head, have done this a couple of times for metric screws, etc.

[Cajun Style]

I used a #2 square on mine and it worked

[B and B]

#2 Drive Bit For Exterior 8 Point Trailer Screws: Hickory Trailer Parts

I would try a different #2 robby bit, one that is more chamfered used for deck screws. Might be a bit smaller.

[nuisance]

I got mine at Harbor Freight

[rblack22]

Ran inti this same issue and me not being savvy at this and the manager at Advance Auto Parts being clueless when I brought a screw in, I ended up buying an assortment type kit for $12.00 or so and it turned out the Square Bit worked. I kept em all anyways jic.

[KD 1]

The #2 Square did work. The NEW one did. I had an old one that I had used up in a camper restore a while back. It was a little worn on the corners but when I dug out a new one I was in business.
Thanks for all the help !