1. * Support Structure* The pergola support kit is made of 2.7mm thickened quality metal with a black coated surface, ensuring enhanced corrosion resistance and preventing easy falling or deformation during use. 2. *Adjustable for Various Post Sizes* Our pergola extension bracket has an inner diameter of 3.5 inches for 4x4 posts (commonly 3.5x3.5 inches in the market), while the other side can be adjusted to fit the actual size of the wooden post. This allows for easy installation, even if you already have existing posts on your pergola. 3. *Enhanced Stability* These heavyduty brackets are designed to deliver exceptional strength and support for timber construction projects. The sturdy craftsmanship ensures a long service life and improves the structural stability of your pergola. 4. *Easy Installation with PreDrilled Holes* Each bracket comes with predrilled holes for quick and convenient assembly. Simply cut the beam to your desired length, choose the position, mark it, drill holes in the wooden beam, and then assemble and secure the nut using the included 30 selftapping screws.