BLCCLOY 20 Sets 2020 Aluminum Extrusion T Slot Corner Bracket 20 Series Extru...

Super strong, nice 6mm bolts, easy to thread every time. These are the best 90 deg fitting that I have found. I'll use these and only these. These are the good ones for any 2020 project.

These corner brackets are amazing and we'll constructed. Quality control is outstanding, with the other brands I'd have a few that weren't useable due to the machined holes not being cut properly. I like that the thickness of the bracket matches the 2020 profile perfectly

Fits my 2020 extrusion OK and holds securely. The provided bolts are M5 and their thread OD is around 4.9 mm, but the oblong holes/slots in the angle brackets measure 6.2 mm across. That's even a bit more than the width of the T-slot in the extrusion (6.15 mm in my case). So this bracket could easily accept M6 also, and the M5 seems a little sloppy to use with this much slot width, but anyway their bolt heads are large enough (9.4 mm OD) and it does work.

First time messing with extrusion and this set of hardware was recommended. Had everything i needed for my project with plenty for future mods. Good bang for the buck.

These fit exactly as intended and have worked perfectly, highly recommend

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

I used these to firm up the frame of a Tronxy X5SA, they worked well and made assembly easier as they kept everything square

Mine came with M6x1 screws, which is fine. My guess is that they ship them with whatever screws and nuts they have at hand at the time. The alignment studs on the angle brackets are only 4.35mm wide for a 6mm slot. That leaves so much slop they might as well not have alignment stubs.