Quick Details: Product name: roofing screws with washers Brand name: xstg Type: roofing screw Material: carbon steel/stainless steel 304,316,410 Diameter: 4.8mm-6.3mm Length: 19mm-200mm Color: white,blue,yellow,zincplated Head style: hex head Surface Treatment: zinc plated(yellow/white/blue zinc),black,Hot DIP Galvanized,Dacromet Rupert Certification: ISO9001 Place of Origin: Hebei China (Mainland)