It's the #2 square bit. At Lowe's they sell white caped stainless screws (w/#2 square head). They are located and used for the white vinyl fencing. They come in packs of 50. I have been replacing just about every screw on the outside with these. Also the screws that hold the vinyl flaps on the inside. Because they are slightly bigger in diameter you can tighten them nice and tight, much better than the OEM screws. The picture below shows how quickly the OEM screws will rust and shows the poor assembly used at the factory. Apparently they had to re-drill two holes. Needless to say I replaced all these screws with the Lowe’s stainless.
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