... Standard:DIN,GB,ISO 3.Diameter: 2.5mm-4.5mm 4.Finished: Zinc coated Quick DetailsPlace of Origin: China(Mainland) Size ... zinc plated, galvanized, nickel plated. Black Standard model: DIN, GB, ISO, ANSI, ASME, JIB etc.Material: Carbon Steel, Stainless steel, Aluminium, Brass ... ability of the nail to penetrate the concrete quickly and with less effort, and produces stronger and more accurate mechanical ...