Although I was bad with no product knowledge, I misunderstood and bought it because it is written that the head flattens. On the other hand, the head became a plate (flat), but because the base is inverted triangle like the base of the countersunk screw, it could not be used where we used it for ordinary rivets. It is useless to use it after having dishes on a steel plate with a little thickness. It was careless.
If it is a usual rivet, my head pops out and there are objects to paint and attach from the top, but the gap becomes matter of concern, but since the head is flattened, the gap can not be formed and the seat is stretched Is possible.