16DUP1 Features: -Duplex nail. -For temporary construction where nail removal is required, such as concrete forming and scaffoldings. -Smooth, uncoated shank and double head ease removal (second head remains exposed). -Made to conform to ASTM F1667. -8 Gauge. Specifications: -Head size: 0.28" / 0.34". -45 Per lb. -1 lb box. -16D Size. -Overall dimensions: 1.75" H x 4.5" W x 3.5" D.