Galvanized flat head drywall screws; OEM from China; Certification:ISO14001:2004 ISO9001:2008 SGS StandardISO,GB,DIN,JIS,ANSI,BSW,ASMEGrade3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9etc.SizeM0.8~M12MaterialStainless,Steel,Brass,Steel,Bronze,Iron,Aluminum,Carbon steel,Alloy steel,silicon bronze,etc.Head/Tread stylesAccording client's requiresCoating/Surface treatmentZinc,Tin,Sn/Pb,Nickel,Chrome, ...