Grip-Rite 16DUP30BK 16D Duplex Nail with Brite Shank, Double-Head, 30 Pounds 3-1/2-Inch, 8-gauge (3-inch length under lower head) Top Head 9/32-inch; lower head 11/32 inches Non-coated smooth shank 30 pound clear resealable bucket with handle Approximately 45 per pound Meets or exceeds appropriate ASTM and UBC specifications