Product Name: All Size Hexagonal Hex Head Coach Screws 50mm 304 Grade Stainless Steel Lag Screw Bolts For Wood DIN571 Galvanized M16 Material: Carbon Steel, Stainless Steel, Titanium, Aluminum, Brass, Nylon, Plastic etc Surface Treatment: Plain, Black, Zinc Plated /According To Your Requirement Size: M1 – M20 /According To Your Requirement Standard: DIN GB ISO JIS BA ANSI Grade: SUS201, SUS304, SUS316, A2-70, A2-80, A4-80, 4.8 6.8 8.8 10.9 12.9 Application: Building, Industry, Machinery, Electronic,etc Quality Policy All the parts manufactured 100% inspection from OQC before shipping. Non-Standards OEM is Available, According to Drawing or Samples