Grip Rite Prime Guard GR3011M 21 Degree Plastic Strip Round Head Bright Coated Collated Framing Nails, 3" x 0.120" 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 Should not be used in treated lumber. Should not be used where surface rust is unacceptable. Meets or Exceeds ASTM F1667 (if applicable)