Standard:ISO,DIN,ANSI(IFI),BSW,UNC,JIS,GB AND PER DRAWINGS Surface Treadment: Zinc Plated,Ruspert,Dacromet..... Self-drilling ScrewsStandard:ISO、DIN、ANSI(IFI)、BSW、UNC、JIS、GB AND PER DRAWINGS Surface Treadment: Zinc Plated,Ruspert,Dacromet..... Self-drilling screws