External Hexagon Head Self Drilling Screw External Hexagon Head Self Drilling Screw,Hex Self Drilling Screws Roofing,White Zinc Plated Self Drilling Screw,Yellow Zinc Plated Self Drilling Screw Handan Jiankun Hardware Products Co., Ltd / Handan best import and export trade co., Ltd , https://www.jkscrew.com Jieyang Oulia Hardware Factory: Specializing in the production of steel ball slides, three sections of slides, three sections of steel beads, slides, three-fold steel ball slides, steel ball tracks, three-fold steel ball tracks, damping slides, stainless steel slides, stainless steel tracks Rails, stainless steel hinges, stainless steel hinges, iron hinges, utility knife series. Welcome to contact Mr. Li, QQ: 6366352, website.