1006 Medium Carbon Steel and Blue Zinc Plating Shenzhen Mrtong Precision Hardware Co., Ltd. Base Info Material:Carbon SteelType:Round Head, Round Head~Head Style:HexagonalConnection:Hinged BoltsGrade:10.9 Description Pre:Stainless Steel Pipe Fittings - Reducer Next:Self Tapping Screw with Pan Framing Head and Galvanization