I did a large project in 4040 aluminum and ordered many angles and other fasteners from Boeray. No problems with any of them. Although I'm using all the metrics I've tested and they're good for 15 series. I walk back and forth on a small extension that is in the canal; sometimes I have to grind it to secure the crosses and sometimes it comes in handy when fastening the bar under axial loading. They're not the prettiest, but they always do their job.