Product Description Post and column bases secure the bottom of posts or columns to concrete and are perfect for decks or patio covers. Models are available for attaching to existing hardened concrete, wet concrete, as well as wood. The BC series is for light base applications. From the Manufacturer 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 by 2-1/2-inch 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 in ZMAX coating.