Bostitch hcfn series high carbon galvanised nails 15 gauge packs of 15003000 bostitch hcfn 50 this pack of 1500 high carbon galvanised nails 50mm from bostitch have been designed for the bostitch concrete block nailer manufactured with high carbon zinc dichromate hcfn finish bostitch hcfn 50 hcfn series high carbon galv nails 15 gauge 50mm pack of 1500