Simpson Strong Tie C410ARN5 Annular Ring Shank Hand Drive Roofing Nail 4d 1-1/2-Inch by 0.134-Inch with 7/16-Inch Head Diameter, Copper Approximately 123 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