Hey Buckland - These mounts for our Rhino Batwing are bomber. We've not had any problems with them. The design and construction was done by a company called Mule. They are located in Issaquah Washington. They only part my wife and I played was to OK the design and pay them for the brackets. They have a CNC machine so I was glad to leave the work for them to do. I'm sorry but I do not know where they sourced the metal from.