Offen called a lag screw. Hex lag bolts are for fastening in wood, Availiable in Carbon Steel; Professional, High Quality
Article: Hex Lag Bolt
Size:1/4''x1''---3/4''x16''
Standard: ANSI
Material: Carbon Steel
Suface&Grade:Grade 2. Zinc plated low carbon steel. Best for general hardware use where high strength is not required;
Cr+3/+6,has a bright mirror-like finish providing sharp looks for a variety of applications
Packing: Bulk/Small Packing/As your request in color and logos, All no problem
Article: Hex Lag Bolt
Size:1/4''x1''---3/4''x16''
Standard: ANSI
Material: Carbon Steel
Suface&Grade:Grade 2. Zinc plated low carbon steel. Best for general hardware use where high strength is not required;
Cr+3/+6,has a bright mirror-like finish providing sharp looks for a variety of applications
Packing: Bulk/Small Packing/As your request in color and logos, All no problem