I need some square tubing to slide inside of another piece of square tubing freely.

I will be working with 2"x2" square tubing 14guage.
The square tubing to slide down inside of it will be 1 3/4" x 1 3/4" 14guage.

I'm thinking the inside of the 2" tubing will be roughly 1 13/16th's which would work. I just need someone smarter than me to verify this is right!!