It looks like cast aluminium, but I'm not an expert.
Yes it is a 90degre angle for a gate with 1 3/8 diameter pipe. I used four of them to build a customized gate for my back yard. It's been working perfectly for the past 20 years. I would advised applying silicon caulk around the parts of the pipes fitting into the elbow on the bottom to keep water out of the interior of the pipe. The lower pipe on my gate rusted thru (for lack of a better term), It developed holes and a brown coating after 18 years and had to be replaced.
I would not recommend it for moving place to place for something that is going to be stationary it's perfect but if you've got to keep moving it place to place they begin to wahler out and not hold tight
I suppose you could but the bolts and nuts worked great for me for the past 20 years.
I made a 9' wide gate. It's currently more of a temporary fence until I can get a gate hinge that will attach to a t-post. I didn't use cyclone fencing, but wire material, so that might be a factor.
about an inch and a half
Full diameter only.
Hello Bill, thank you for your question. The standard size is 1-38" for gate elbows. The Pro Desk may have alternatives, but you likely won't find other sizes than 1-3/8" on the shelf. Regards, you YardGard support team.
Hello Djibson, thank you for your question. Please check with the Home Depot pro desk to see if they have this size available through their special order system. Regards, your YardGard support team.
Pierre, I'm not sure what "inm" means in your post; perhaps it is a typo. If you are asking for the pipe diameter it is 1 3/8 inches (25.4mm).