VEVOR 8 Pcs 4x4 Post Base Bracket Wood Fence Post Anchor Inner Size 3.6x3.6 inProduct Features Stable Support Each post base measures 3. 78 x 3. 78 inch, with a total of 8 pieces. The inner tube size is 3. 6 x 3. 6 inch, and the bottom cross section size is 5. 5 x 5. 5 inch. It is recommended for use with 3. 5 x 3. 5 inch posts. The fully enclosed design provides secure, effective support and ensures no wobbling during use Durable and Sturdy This post bracket is made of carbon steel with a wall thickness of 0. 08 inch, ensuring