G'day

Can anyone help with this problem?
I'm currently building a hardwood deck and fixing with SS square drive 10g screws.
At the end of the deck i'm doing acreen, also out of decking, and need to fix it to 30x30mm box galv as it butts up against one of the pergola posts which is 50x50mm (30mm for the frame + 20mm for decking = 50mm).
Anyway I'm trying to find 40mm SS (304 or 316 preferably) square drive screw suitable for metal, to fix the decking with but am having no luck.
Has anyone used such a product or knows if it exists even? have only been able to find a phillips head equivalent.

Cheers,

Ricey.


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