Crown Bolt 87440 01410 5/16-Inch by 3-Inch Zinc Plated Steel Hex Head Lag Screws, 50-Pack Zinc Plated 5/16-Inch X 3-Inch Lag Screw Hex Head For wood applications 5/16-Inch-18 Body Diameter And Thread Pitch 3-Inch Fastener Length Zinc Plated Finish