Baykailin 10Pcs 2020 Corner Bracket Joint Plate L Shape 5 Hole Aluminum Extrusion Connector with 50Pcs T-Nuts, 50Pcs Screws and 1Pcs Wrench for 20 x 20mm Series Aluminum Extrusion Profile Silver

A couple of the brackets showed up with blemishes/scratches. I was able to put them in a place where you can't see them, but I was disappointed that they did not all look nice.

They were fine for the project I'm building

These Corner L Shape Bracket Joint Plates are ideal for all of your DIY Table top Digital Manufacturing projects. 3D Printers, Laser etchers, CNC routers, and automation of all kinds including robots. You can buy all the extrusion you need but you must have the fitting and connects needed to assemble your project. These L Shape brackets make the corners of any frame very strong. In most cases you can do it without these parts. The are quick and easy to install. These must be in the DIY machine builders tool box.

This bracket kit comes in a tiny box. That tiny box contains everything you need to brace up your aluminum extrusion project. You get the brackets, the M5 button head hex screws, the t-nuts, and a hex Allen wrench to boot. Open the box, unwrap the brackets, and slap them onto your project. The quality appears to be very good, and they look great. I tried a couple of the screws and nuts, and they went together smoothly with no binding. The hole spacing is spot on for my 2020 aluminum. I have a couple of projects in mind for these. First and foremost is my small CNC build. While these won't be providing the primary bracing, they will add an extra layer of rigidity and some heft to the build. This is a solid kit at a good price. Highly recommended.

These are all consistently sized and shaped. The finish/coating is nice and smooth and free of any imperfections or blemishes. The holes are clean and even. They are quality made and are sturdy/solid. All the hardware and screws you need are included.