4.5mm-30mm Grommets Silicone Rubber Snap-on Open Blind Plug Bung Bush Black
20mm 21mm 22mm 23mm 24mm 25mm 26mm 27mm 28mm 29mm 30mm. -Silicone rubber is a soft and elastic material with good sealing type, high and low temperature resistance, aging, acid and alkali corrosion resistance.