Socket Size Required For Installation: 1/2" External Hex Drive ASTM A307 Compliant Hot Dipped Galvanized For Superior Corrosion Resistance Specifications Met/Exceeded: Coating Specifications: ASTM F2329/F2329M or ASTM A153/A153M ; Steel Mechanical Specifications: ASTM A307 Grade A ; Dimensional Specifications: ASME B18.2.1 Threaded Length: 2" of Thread Minimum Coating Thickness: 0.0017” (43 microns) Kit Includes: 100 Lag Screws and 100 EA USS Flat Washers HDG lag screws, also known as lag bolts, are heavy-duty fasteners used primarily in woodworking and construction projects. They are designed for strong, secure connections and are particularly useful for: Deck construction: Ideal for securing heavy lumber and framing heavy structures. Woodworking: Versatile for various projects where durability and load-bearing strength are essential. Outdoor applications: The HDG coating provides enhanced corrosion resistance, making them suitable for marine and coastal environments. Heavy-duty applications: They are commonly used to attach heavy objects and secure large wooden structures. Overall, HDG lag screws are a reliable choice for projects requiring robust fastening solutions.