Self Drilling Screw with Bugle Head Tianjin Ruiya Internation St Co., Ltd. Base Info Model NO.:SDSMaterial:Carbon SteelType:Hexagon HeadHead Style:RoundConnection:Common BoltGrade:12.9Trademark:E-starOrigin:China Mainland Description Pre:Self-Drilling Screw with Flat Head Next:Zinc Wood Screw With Cross Head