4x4 Post Base 4 Pcs, Inner Size 3.6x3.6 inch / 92x92 mm Post Brackets, Heavy Duty Carbon Steel Decking Posts, Wood Posts Brackets for Pavilion Deck Railing Support Deck Base Plate, BlackProduct Features Stable Support Each post base measures 3. 78 x 3. 78 inch, with a total of 4 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