Hexagonal shaped head of stopper prevents it from rolling off of the Bench top. Flat surface will also permit stopper to be inverted and placed on end, thereby preventing possible contamination of ground surface.

• Is Discontinued By Manufacturer ‏ : ‎ No
• Package Dimensions ‏ : ‎ 2 x 2 x 2 inches; 0.04 ounces
• Date First Available ‏ : ‎ January 3, 2017
• Manufacturer ‏ : ‎ Chemglass Life Sciences