Crown Bolt 01560 3/8 Inch-16 x 4-1/2 Inch Zinc-Plated Steel Hex-Head Lag Screws, 50-Count Zinc-plated 3/8 inch-16 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