For pressure treated lumber, galvanized for rust prevention. Spiral/screw shank for penetration and holding power. No. 701521: Size: 10d, Length: 3 In., Finish: Hot Dipped Galvanized, Diameter: 10 ga, Head Diameter: 9/32 In., Shank Type: Spiral, Head Type: Flat, Point Type: Diamond, Package Size: 5 Lb., Pkg Qty: 380, Package Type: Box Prop. 65 Warning for California Residents: This product may contain chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.