... which produce common wire nail, umbrella roofing nails, coil nail, building nails, screw nail, concrete nail, also we can supply ... : smooth, grooved, spiral, twist5) Head Diameter: 2-6mm6) Point: diamond point7) Surface treatment: polished, galvanized, annealing8) Features: ... box, 20-25kg/carton; bulk packing.Blacking concrete nail, Bluing concrete nails Specification2×20mm2×25mm2×30mm2.5×25mm2 ...