I'm going to us flight steps from a turbine helicopter.
The step is cast aluminum and the tube is stainless.
I have a couple of pairs of these on hand per the pix. They're not from the same aircraft and I don't have history of documantation otherwise they'd be worth considerably more.
I don't recall the angles I used to make the brackets and the drawings got disappeard when my flash drive got cooked. Back up data? yup, I should.....
The angles are easy enough to determine if your have a digital angle finder like a "Angle Cube" or about any angle indicator.
These steps come with free bragging rights that we are savvy by using real helicopter parts on our builds.
Now the shamless pitch....
While the braggin' rights are free the steps are a hundred thirty a pair and about thirteen dollars for USPS shipping with insurance.
Yes, and you have to make the brackets.
Oops, should this be in classifeds?.... maybe Mike and his henchmen will ovelook it.