1.headform:buttrefly 2.length:4-60mm 3.thread specification:m3-m16 4.finish:galvanize Item NameFastenerMaterialPure Titanium and Alloy ... -4V),Gr7,Gr9,Gr12, etc.StandardGB,DIN, IFI,UNC,UNC,JIS, BS,BSW ,ISODIN912,913,914,915,916,931,933,7991 ... ,7984,6921,ISO 7380,JIS,BS etc.SpecificationScrew: M2.5--M64*L6—300mm (or as ...