4x4 half base z-max. The BC series offers dual-purpose post cap/base for light cap or base connections. Do not install bolts into pilot holes. Install with 16d common nails or 16d x 2-1/2" joist hanger nails. Post bases do not provide adequate resistance to prevent members from rotating about the base and are not recommended for non top-supported installations (such as fences or unbraced carports). 18-gauge galvanized steel. Some sizes available with ZMAX coating. 4 x 4 post base, 3-9/16" W. x 3-1/4" L. x 2-1/4" H.; use 6-16d fasteners on post flange and 4-16d on base bottom