Simpson Strong Tie C310ARN1 Annular Ring Shank Hand Drive Roofing Nail 3d 1-1/4-Inch by 0.134-Inch with 7/16-Inch Head Diameter, Copper Approximately 147 nails per pound Large, flat head provides extra bearing surface to firmly secure roofing material Smooth Head Annular ring shank increases pull-out resistance Diamond point for easier driving