Simpson Strong-Tie BC ZMAX Galvanized Post Cap for 4X 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 in ZMax coating. Features Provides a positive connection for a post to a wood deck Stronger than angled nailing or screw fastening Reduces the chance of the post splitting and eliminates nailing into end grain Not recommended for non top-supported installations (such as fences or unbraced carports) Nominal post size: 4x USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.