Fits 3.5x3.5 Inch Wood Posts: This 4x4 pergola kit is ideal for building a pitched-roof pergola and fits actual wood sizes of 3.5 x 3.5 inches (92 x 92 mm), compatible with both softwood and hardwood Pergola Brackets Set: These pergola brackets are designed for pitched-roof pergolas or custom DIY woodworking. The sturdy T-shape connector guards wood posts from weather damage Rustproof Expansion Bolts: Our gazebo kit includes 304 stainless steel expansion bolts extended to 2.36 inches (60 mm), providing deeper, more secure installation in outdoor environments like storms or strong winds Built to Last: This pergola hardware is made from 2 mm carbon steel with a corrosion-resistant black powder coating. The full-coverage design keeps the posts protected from rain and deformation Made for Outdoor Use: Our pergola bracket kit features a black powder coating that helps reduce rust and corrosion, making it ideal for long-term outdoor applications