22Pcs 2020 Aluminum Extrusion Accessories Connectors Corner End Caps L Brackets 3-Way End Corner Angle Bracket Silver T Slot Interior Corner Joint Bracket Slot Connector Set 6mm with Screws&Wrench

This has the basic components you need to start projects. Maybe not everything, but I was able to use all of the parts here with no wasted parts. Price seems fair for what you get. Quality is excellent.

Made a custom Ender 5 type of 3d printer using these and helped me from drilling holes everywhere. Very sturdy design.

Nicely coated and work as intended

I really like the 3-Way End Corner Bracket Connector. The L shaped inside corner brackets break easily if any force is applied to them. If you are using corner joint plates for the strength in your joint, then these will be great to hold you joint in position until you put the plates on.

Perfect fit, good quality and price

Wish it had two time the L brackets

If you are building anything with 2020 extrusions then these are an absolute must have. They are made well and are very sturdy. Out of pure curiosity I made a “T” with these and a bracket on each side and then stood on it between two cinder blocks. To my surprise the brackets were not the weak point… and I am 200 pounds. Good little things.

Doesn't fit. Poor tolerances.