Prime-Line 9056351 Hex Lag Screws, 3/8 in. X 3-1/2 in., A307 Grade A Hot Dip Galvanized Steel, 25-Pack
Brand: PRIME-LINE
Size: 3/8 inch X 3-1/2 inch
Heavy duty wood screw with 6 sided hex bolt head
Features deep wood screw threads and does not accept a nut
Used in applications where standard wood screws cannot support the load (deck building, etc.)
Requires pilot hole to be drilled and installs using wrench or socket tool