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 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 tapping screws, supplying all needed components for effortless assembly of fence posts and structural supports & 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 Versatile Outdoor Use: Ideal for anchoring pergola posts, porch railings, and other outdoor constructions on both concrete and wooden decks, stability for landscaping needs, Manufacturer: Laikoutd