Shape: steel wire, flat countersunk head, diamond or needle  point, flutes or smooth shank Surface treatment: bright, galvanized, E.G., H.D.G Specification: Black concrete nails 2×20mm2×25mm2×30mm 2.5×25mm2.5×30mm2.5×40mm 3×30mm3×40mm3×50mm 3×60mm 3×60mm3×70mm 3×80mm3×90mm3×100mm 4.2×75mm4.2×100mm4.2×125mm flat countersunk head 2.5×25mm2.5×30mm2.5×40mm 3×30mm3×40mm3.2×50mm 3.6×65mm4×75mm4.2×100mm K concrete nails T concrete nails 3×25mm3×40mm3.8×25mm 3.8×40mm3.8×50mm3.8×65mm 3.8×75mm3.8×100mm Galvanized concrete nails （smooth shank） 1.8×20mm4.2×75mm 2×25mm4.57×100mm 3×40mm4.8×80mm 3.4×50mm4.8×90mm 3.8×65mm5×125mm Packing: 0.5kg/box,1kg/box,20-25kg/carton, 48 cartons/wooden pallet; as customer's requirement.