Quality Supported Structure: The pergola top bracket kit made of 2.7mm thickened high-quality metal and -coat for extra corrosion resistance,it will not easily break off and be out of shape when using. Adjustable: Our Inner diameter of the pergola extension bracket is 3.55 inch,use for 4 x 4 Post (Actual 3.5inch x 3.5inch on market ),the other side can be adjusted according to the actual size of the wooden column.(Can be opened to fit post already being used on pergola) Enhanced Stability: These brackets are extremely thick and heavy.Rugged craftsmanship provided additional structural stability and support for wooden construction projects. DIY Pergola Kit: If you are looking for a modern pergola to build or extend your pergola, but don't want to spend a lot of money,our pergola hardware is a good choice.Use this extension pergola bracket used for balcony,courtyard,patios,commercial venues and park,you can build the perfect outdoor place gathering or entertainment. 3-WAY T BRACKET: Each heavy duty bracket has pre-drilled holes,just cut to the length you want and choose desired location,mark it,drill holes on the wooden , assemble and lock nuts. Colour:black Material:Metal Package Contents: 2 x Pergola Corner Brackets Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.