... nail galvanized 45#steel concrete nails head diameter-7mm, shank diameter-3.8mm, length-50mm strength-HRC52 Galvanized Steel Concrete Nail ... flat, round flat, oval, headless...Shank type: smooth, spiral, Annular, grooved...Surface treatment: galvanized, black, HDG, ,YZP...Head diameter ... : 3/16"~1/2"Shank diameter:1.5mm~6. ...