Sb16 series galvanised 16 gauge straight finish nails and fuel cell to suit gfn1664k cordless nailers their diameters are less than the coil and stick nails and they are primarily used for finish and trim work in the construction and joinery industries finish nails and brads have heads that are rectangular they are the same width as the shank but the breadth of them is greater than the shank this ensures that their holding power is enhanced but of course the pull through force is lower than for