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[Ttt1601]

5mm is too big, depending on the tile I'd go 3mm or if it suits even a 2mm

 

[GoneGuy]

With the size of the tiles I was going to use raimondi 3mm clips.

 

[Tile Superstores Ringwood]

I would recommend Sigma for sure, 2-3mm joint is best in my opinion, especially if it's a rectified porcelain.

 

[demi34]

2mm