Lab cork stand 80mm outer diameter x 30mm inner diameter, suitable for 10-250mL flasks.
Lab cork stand 110mm outer diameter x 60mm inner diameter, suitable for 100-1000mL flasks.
Lab cork stand 140mm outer diameter x 90mm inner diameter, suitable for 500-2000mL flasks.
Extra large lab cork stand 160mm (6.3") outer diameter x 105mm (4.1") inner diameter, suitable for 3000-20000mL flasks.
Made of compressed cork material. Durable and affordable.