The 4 finger cork lined extension clamp opens 90mm (3.5") to hold flasks, burets, tubes and other objects; only $8.95; big discounts for 10 or more.
This clamp has a cork lining and insulates the metal if you are applying heat to the glass. It can be closed down to a~3mm gap or opened to ~90mm. It requires a separate bosshead (clampholder) to attach to the support stand rod.
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