... :1.5mm-6mm Shank: Smooth Accept custom-made Common Nail, Iron Nail, Roofing Nail, Concrete Nail, Steel Nailmaterials: Q195, Q235Finish: Bright, Electro Galvanized, Hot ... Dipped Galvanized, Painted,etcReference specifications:Concrete Steel NailsElectro-GalvanizedBlue-FinishedNail LengthGauge ...