Tama SRW620P Hold Tight Tension Rod WashersTama Hold Tight: cup-shaped stainless steel washers that contain a rubber ring so the tension rod pushes both the cup washer and the rubber ring. Normally vibrations will eventually loosen the tension rod. But the softness of Hold Tight's rubber ring keeps it in contact with both the tension rod and the hoop at all times and maintains friction between them so that tension is always preserved. Contains 20 pieces.