Duplex Head Nail We supply common nails, concrete nails, Duplex head nails and other nails for export. Duplex head nails application: Duplex head nails are used for temporary construction, such as form work or scaffolding. The double head on this nail makes it easy to pull out when forms or scaffolding are torn down. Product Description Size: 6D 8D 10D 12D 16D 20D 30D Length: 1-3/4" 2-1/4" 2-3/4" 2-7/8" 3" 3-1/2" 4" Diameter. 113". 131". 148". 155". 162". 192" 0. 207" Packing 50LBS PER CARTON, 48CTN/PALLET Bulk Duplex Nails with Diamond point. Finish: Bright and Electric Galv and HD Galv and Mech Galv Shank: Smooth Shank Material: Wire Rod.