Bostitch bt 13 series galvanised 18 gauge brad nails and fuel packs of 2000 bostitch 18g45fc this pack of 2000 bt13 series galvanised 45mm brad nails and fuel from bostitch have a rectangular cross section and are compatible with the bostitch gbt1850k cordless gas brad nailer equipped with diameters less than coil and stick nails while manufactured using 18 gauge wire these nails feature rectangular heads measuring the same width as the shank although the breadth is greater than the sh