Sturdy Structure: Measuring 5.7x3.8x5.9 inches (14.5x9.8x15 cm) with an internal size of 3.8x3.8 inches, these post bases a firm and stable base for 3.7x3.7 inch posts, great for pergolas and deck railings. & Weather Resistant: Crafted from premium iron with a 0.08 inch (0.2 cm) wall thickness, these bases include a coated layer for enhanced rust resistance and dependable outdoor use. Easy Tool Installation: Pre drilled holes and provided fasteners enable quick setup—simply follow the instructions and utilize a drill when necessary for concrete or wooden surfaces. Complete Hardware Package: Each set contains 16 expansion screws and 48 screws, supplying all needed components for effortless assembly of fence posts and structural supports. Versatile Outdoor Use: Ideal for anchoring pergola posts, porch railings, and other outdoor constructions on both concrete and wooden decks, delivering stability for landscaping needs.