Slide gate constructed using 2" X 2" RHS as frame with 2" X 3/8" flat steel, formed to make a reflected curve.
Lowest section is 2" X 4" RHS, to add strength as well as help conceal wheels.
Middle cross section is 2" X 4" RHS to allow use of larger FAC nylon guide rollers.
Fill material is 5/8" round steel.
Circles are formed using 1/2" round steel.