Fits 3.5x3.5 Inch Wood Posts: This 4x4 pergola kit helps you easily build a double-sided flat-roof pergola and fits actual wood sizes of 3.5 x 3.5 inches (92 x 92 mm), suitable for both softwood and hardwood Pergola Brackets Kit: Ideal for double flat-roof pergola construction or DIY projects like tables, the solid T-shaped bracket keeps posts from rain damage and sun-induced cracking or decay Built to Last: This gazebo kit is made of 2 mm carbon steel with a black powder-coated finish that helps resist corrosion, warping, and cracking. The full-wrap design enhances long-term stability Made for Outdoor Use: Designed for outdoor environments, our pergola hardware features a black powder coating that helps slow down rust and corrosion, keeping your pergola durable over time Shade Sail Attachment Holes: Use this pergola bracket kit to hang a shade sail that blocks sunlight and adds rain protection. The detachable design also makes maintenance and cleaning much easier