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Some flags have nowhere to go into the ground. A steel base plate is the answer there: it sits flat on the floor, takes the pole and holds it upright, with no pegs and nothing drilled into the surface.
That makes it the add-on to reach for indoors and on sealed ground: shopping centre concourses, foyers, showroom floors and paved entries.
It is an accessory rather than a flag in its own right, so add it to the order for the flag you are running, or pick one up for a set you already own if a flag is moving off grass and onto a hard floor.