Crown Bolt 87560 01560 3/8-Inch by 4-1/2-Inch Zinc Plated Steel Hex-Head Lag Screws, 25-Pack Zinc Plated 3/8-Inch X 4-1/2-Inch Lag Screw Hex Head For wood applications 3/8-Inch-16 Body Diameter And Thread Pitch 4-1/2-Inch Fastener Length Zinc Plated Finish