Grip Rite Prime Guard GRF1622M 16 Gauge Electrogalvanized Straight Collated Finish Nails, 2" For best results use with Grip-rite GRTFN250 16 Gauge Finish Nailer Compatible with most 16 gauge straight finish nailers. Should not be used in treated lumber. Should not be used where surface rust is unacceptable. Meets or Exceeds ASTM F1667 (if applicable)