Laboratory Cork Ring, 4-1/4 inch.
Used to hold round bottom flasks, beakers and other glass containers snuggly to ensure against breakage. This ring size is good for flasks sizes 250mL to 500mL. NC-11130
$4.95
Laboratory Cork Ring, 5-1/2 inch
Used to hold round bottom flasks, beakers and other glass containers snuggly to ensure against breakage. This ring size is good for flasks sizes 1000mL to 4000mL. NC-12812
$6.95
