Galvanized flat head drywall screws; OEM from China; Certification: ... ,Aluminum,Carbon steel,Alloy steel,silicon bronze,etc.Head/Tread stylesAccording client's requiresCoating/Surface treatmentZinc,Tin ... wing nuts, weld nuts, square nuts, cap nuts.Washers: flat washers, spring washers, lock washers, structural Washers. square ... of TransportationThe Best Choice for You Galvanized flat head drywall screws