4x4 are ideal size hardwood for external post supports. Very expensive hardwood to buy and difficult to obtain in any local durable hardwood.
I have used recycled hardwood to make window and door frames but 4 inches would only be useful in a fine glazed door or window without laminating. You could build a great looking bushfire resistant door with 4x2 spotted gum. Many window and door fabricators use recycled hardwood.
Also external stair treads or tables with spaced 4 inch sections.
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