6 gauge screws have a shank diameter of approx. 3.5mm.
Length is measured from the widest part of the head to the point.
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These are great. Slotted head replicates those used pre war and the material is tougher.
For car restoration these screws look like the originals used in the prewar period. The added advantage is that they are non corrosive, strong and are self tappers. Great service too.