Grip Rite Prime Guard GR04HG1M 21 Degree Plastic Strip Round Head Hot Dipped Galvanized Collated Framing Nails, 2" x 0.113" For best results, use with Grip-Rite GRTFR83 and/or GRTRH350 21 degree round head framing nailers Compatible with most 21 degree round head framing nailers including: Bostitch, dealt, Duo-Fast, Hitachi, Makita, Porter-cable, Ridgid and Senco Hot Dipped Galvanized to meet or exceed ASTMA 153 Class D. For use on exterior applications and with all treated lumber. Meets or Exceeds ASTM F1667 (if applicable)