Hex Head Self Dilling Screw Hangzhou Huachao Fastener Co., Ltd. Base Info Material:Carbon SteelShape of Head:HexagonSurface Finishing:Zinc PlatedCertification:ISOCustomized:CustomizedTrademark:HANGCHAOOrigin:ChinaHS Code:73181400 Description Pre:GFRP Self-Drilling Tubular Grouting Bolt Next:Hex Head Self Dilling Screw