2020 Series Aluminum Extrusion Profile Connector with 2028 Corner Bracket, 62pcs T-Slot Sliding Nuts and Hex Screw Bolt Include a Wrench, for 6mm 20S Extruded AL Profile Rail Reinforcing 30 Set

I’m really impressed with the quality of this PETOX Aluminum Extrusion Connector Set. Usually, when you buy these bulk hardware kits, you expect a few bunged-up threads or missing pieces, but everything in this 30-set pack was spot on. The black finish on the corner brackets is nice and consistent, which makes my 2020 frame build look much more high-end than the raw silver ones. The included T-nuts slide smoothly into the rails without jamming, and having the right size wrench included in the box meant I could get straight to work. For the price, it’s a massive time-saver for anyone doing DIY 3D printer or sim rig projects.

These worked perfectly for all the inside corners on my 10-inch equipment rack using 2020 extrusion. Combined with an outside gusset, the joints are very strong and don't interfere with equipment mounting. There is enough slop in the oval holes to allow alignment, then they hold tight. Glad to have this in my 2020 inventory.

The 90s work great. But all the hardware started rusting within a month.

Work great, but can't mount perpendicular to the channels. The little tabs that help align it have to be in a place that conflicts with the aluminum if you try to turn it 90 degrees. Perhaps this is just me being new to 2020-series. But I ended up needing to pick up additional angles that don't have these alignment tabs for my projects.

Not a bad set but useless if you don't have access to the end of the extrusion. Attempting to use those corner braces would prove interesting.