concrete nail 1)Materials: #45 high grade carbon steel 2)Length:13mm to 150mm Diameter:1.6mm to 5.5mm Shank:smooth,spiral and grooved shank 3)production line which afford more than 10 tons concrete nails per day. 4) Packing: 250g/box 50boxes/carton, or 500g/box 50boxes/carton,1kg/box 25boxes/carton 5)Factory Located in Linyi City which near Qingdao Port,Rizhao Port and Lianyungang Port. Contact: Tony Zhu Skype:chlong.417 Mobile:86-189 539 88520