Yes, however there may be other considerations. Typically, interior rods are powder-coated 5/8" diameter round steel 1mm wall thickness and available in 8 or 6Ft lengths. Interior rods are powder-coated steel which should weather fine as long as the ends are sealed with a polyurethane adhesive (Loctite PL) to stop water. Exterior grade rods are aluminum with a coating inside (moisture inhibitor) improving longevity and weather performance. These are 6Ft lengths and 1.5mm wall thickness.

Manufacturers recommend 4 foot post spacing to limit flex when lateral pressure is applied. Most standard residential applications call for 36 inch handrail handrail height which need 8 rods for level and 7 for angle/ pitch staircase(s).