*Key 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 long-lasting durability. The surface is powder-coated for corrosion and rust resistance, providing a long service life *Installation is a Breeze: You can quickly install it by following the user manual. Simply drill holes with a power drill, use the screw holes, and secure with screws. The process is time-saving and effortless *Complete Accessories: Our post anchor includes M8*60 Self-Tapping Screws, 12*60 Expansion Screws, M8 Washers, M5*25 Wood Screws, 8-13 Double-Ended Wrench, making installation straightforward and easy *Wide Application: The dual-purpose screws are suitable for both concrete and wooden floor installations. This post base can be widely used in pergolas, porch railings, column supports, and more, providing secure support *Specifications Item Model Number: QB-4in-4 Kit Quantity: 4 pcs External Dimensions: 3.78 x 3.78 inch / 96 x 96 mm Internal Dimensions: 3.6 x 3.6 inch / 92 x 92 mm Base Cross-section: 5.5 x 5.5 inch / 140 x 140 mm Wall Thickness: 2mm Net Weight: 11 lbs / 5.0 kg Product Dimensions: 5.51 x 5.51 x 5.51 inch / 140 x 140 x 140 mm *Package Content Post Bases x 4 M8*60 Self-Tapping Screws x 24 12*60 Expansion Bolts x 24 M8 Washers x 24 M5*25 Wood Screws x 32 Base Brackets x 4 8-13 Double-Open End Wrench x 1