QualGearCC2-B-100-P Premium Quality RG6 Cable Clips, 100 Pack

How long is the nail? i see another product with a nail length of .685" for $4.60 http://www.amazon.com/cable-clip-black-rg6-100-pieces/dp/b000i98z1y

What is the finish of the nail? Suitable for outdoor use, without rusting?

What is the diameter of cable this will support? I purchased 6mm clips, but got 10mm. I need 6.5mm or 1/4" MAX.

Can these be manually screwed in or do you need tools to do that?