20pcs Black 2020 Series L-Shape Interior Inside Corner Connector Joint Bracket with Screws + 1pcs Wrench for Slot 6mm 20S Aluminum Rail Accessorie...

Heavy duty hardware, made to last, good price for the amount you recieve

I've tried a few of these now, they fit together. Nothing was threaded wrong for me. These are nice to have around when assembling supports for my Ender 5 cover.

When these were manufactured, they were painted with a thick paint, threads and all. The set screws were so soft, the hex would strip out before the screw was seated. In order to make these work, I had to : 1) Tap each of the threaded holes to remove the paint 2) Replace the set screws with decent ones so that I could actually tighten them without stripping them Do yourself a favor and get good ones instead of messing around with these.

Fits perfect for the t slot extrusions I'm using. None of the threads of the nuts used for warped or bad so everything came together nicely!

Good low-load L brackets. I wouldn't use these for applications in heavy things, but they are a good size for lighter alluminum rail projects like those listed in the product description. The listing states that the brackets and fasteners are made of zinc which is harder than alluminum, so be careful to not over tighten if threading the fasteners into aluminum threads to prevent damaging the aluminum threads - another reason I would only recommend these for low load applications. As others have stated, these come with the wrong sized allen wrench, which isn't really a big deal but is just a minor inconvienence (and a waste on the manufacturers part). Overall good brackets though.