Hex Washer/Flange Self Drilling Screw (DIN7504K) Hangzhou Huachao Fastener Co., Ltd. Base Info Model NO.:DIN7504KMaterial:Carbon SteelType:Hexagon HeadGroove:HexagonHead Style:HexagonalStandard:DIN, GB, ANSI, BSW, JIS, GOSTGrade:8.8Trademark:HANGCHAOOrigin:ChinaHS Code:73181400 Description Pre:Hex Washer Head SDS With Ribs (DIN7504K) Next:Hexagon Bolt (DIN933) Stainless Steel 304/316