... , shank diameter-3.8mm, length-50mm strength-HRC52 Galvanized Steel Concrete Nail Use for construction Nails series specification options,Material:Iron, carbon ... , headless...Shank type: smooth, spiral, Annular, grooved...Surface treatment: galvanized, black, HDG, ,YZP...Head diameter: 3/16"~1/2"Shank diameter ... ,small box,carton then pallet or as customers' requirement. Galvanized Concrete Nail