Crown Bolt 87580 01590 3/8-Inch 16 by 6-Inch Zinc Plated Steel Hex-Head Lag Screws, 25-Pack Zinc Plated 3/8-Inch X 6-Inch Lag Screw Hex Head For wood applications 3/8-Inch-16 Body Diameter And Thread Pitch 6-Inch Fastener Length Zinc Plated Finish