20 Set 78x78mm 2020 Aluminum Extrusion T Slot Corner Bracket 20 Series Extruded Hardware 90 Degree Right Angle Connector with M5 Bolts Nuts for 20/20 80 20 2040 T V Slot Black Aluminum Profile

Arrive on time perfect for what I needed them for

Fast, Just as described.

Used these to elongate my laser bed. Perfect fit and strong hold. No jumping or skipping when crossing the joint.

The corner idea is good but prongs would break off if there was any shifting while fitting or moving due to shearing. Luckily I was able to reuse the broken corner brackets for the door, with a bit of sanding smooth and painting. It would be great if they were made of something stronger. Fit very well w the tbar 2020s, however. The parts (set screws, hex wrench) were complete and very handy.Not recommended for anything that might need to be moved regularly.

The twist lock fasteners were great and I could pop them in anywhere and not just from the end

While converting one of my old 3D printers into an enclosure, I decided to replace all of the plastic printed parts. I swapped out the corner triangles for these metal ones and it's far more solid now, no flex whatsoever. As an added benefit, they provide a small "shelf" at each corner to sit a platform on.

I love how easy and stable it was. I used it to add a seat to the rear of my golf cart. Worked great.

These are poor quality. The set-screws in the package are not the same length so many of them do not reach the depth of the channel while still holding in the corner bracket. Therefore, the do not hold firmly. I Bought these, the inside L, and 2 types of mending plates; as well as a 10 pack of 2020. The other products worked fine, though of 4 different attachment components and 3 different allen key sizes...poorly controlled standards across products.