Review on Hidden Bracket Aluminum Extrusion 25X25X10Mm by James Roper

Suitable for fairly standard aluminum profiles such as V-groove. They look just like the ones I've used in the past. They're not the most expensive, nor are they the most expensive, but the free shipping makes all the difference. The delivery was very quick. No complaints and will likely buy again if I need more. I mostly have V-grooves, so I can't say if they will fit all existing extrusion designs. Copies usually come from China. I have a couple of Delta 3D printers that use profiles made in China and the corner brackets fit perfectly. These brackets also come with (2) set screws. With other angle brackets I've purchased, I had to thread a tap through the threaded holes to remove some of the molded pads that were restricting installation and/or tightening of the set screws. This seems to be a common problem with these types of angle brackets in general. In my experience to date, the need to use a tap to clean threaded holes is about 15% of the staples used. It's a production issue.