Size: 121 x 121 mm With long-lasting durability and stability, these post bases provide solid support for your posts! Stable and long-lasting frame: The hot-dip galvanised steel frame is strong, stable, durable, and resistant to corrosion and harsh weather, ensuring long-lasting performance. Strong support: The post base can be mounted to hard surfaces such as concrete and wood, holding the post or support structure in place and providing stability. Wide applications: The post base bracket is perfect for supporting gazebo posts, porch rails, fence posts, and stair rails, and can also be used as the support bracket for table legs or mailbox posts. Good to know: Delivery includes the post base only; you need to purchase the matching mounting accessories separately.