Sturdy Support: Each post base measures 5.7x3.8x5.9 inches (14.5 x 9.8 x 15 cm), Designed with inner dimensions of 3.8 x 3.8 inches, these connectors are perfect for 3.7 x 3.7 inch columns. The full-wrap structure guarantees stable and wobble-free support for your projects.Sturdy and stable: These connectors are made of high-quality materials with a wall thickness of 0.08 inches (0.2 centimeters), which are durable and long-lasting. Spray coating has excellent corrosion resistance and rust prevention, ensuring long-term reliable performance.Easy to install: Installing these bases is effortless! Just follow the user manual and use a drill bit to drill holes as needed. By pre drilled screw holes, you can easily and quickly make settings.Complete set of accessories: This kit comes with everything necessary for installation, including 16 expansion screws and 48 self tapping screws. Each component is included to ensure a smooth and efficient installationVersatile Applications:Perfectly suited for both concrete and wooden floor projects, these screws are ideal for securing pergolas, porch railings, columns, and other structures. Enjoy peace of mind knowing your installations are stable and reliable.