BOSTITCH RH-S8DR131-HQ Hurriquake 21-Degree 2-1/2-by-0.131-Inch Plastic Collated Stick Framing Nails, 4000 per Box Up to 25-Percent larger effective head area that adds increased pull-through resistance and decreases overdriving of nails Deep Ring Technology delivers outstanding holding power in hurricane conditions Screw Shank fills voids in sheathing created by rings, while the smooth shank provides increased shear strength at primary stress point for earthquake conditions Easy to identify head ID to aid building inspectors 2-1/2-by-0.131-Inch