Coarse Thread Drywall Screw Tianjin Ruiya Internation St Co., Ltd. Base Info Model NO.:DWSMaterial:Carbon SteelType:Hexagon HeadHead Style:RoundConnection:Common BoltGrade:12.9Trademark:E-starOrigin:China Mainland Description Pre:China Manufacturer High Grade Steel Hollow Grouting Self Drilling Anchor Bar Next:Airport Ground Support Equipment Ground Anchor Bar