The powder - coated pergola brackets are made of durable carbon structural steel, which offers excellent performance against abrasion, corrosion and rust. The 3 - way right angle corner brackets ensure weather - proof performance and a stable frame even in inclement weather. This product is easy to assemble as the set includes 2 pergola bracket shoulders, 2 pergola bracket boots and all necessary lag bolts. All you need to do is cut the wood to the desired length and assemble. It can accommodate 4 in. x 4 in. lumber with an exact measurement of 3. 5 in. x 3. 5 in. The thickened plate, with a thickness of 0. 1 in. makes the pergola brackets boot resistant to breakage and deformation. Additionally, the steel box design provides extra structural stability and support for the pergola. The DIY pergola kit allows you to build your own pergola in less than a day at a fraction of the cost of other products. The heavy steel braces are strong and stabilizing. These brackets are widely used in various places such as balconies, courtyards, parks, restaurants and commercial venues. Their stable structure, framework and black powder - coated plate make them suitable for building pergolas for outdoor gatherings or entertainment.