Product description of Universal Retort Stand Clamp 4 Prongs: The chrome plated 4 prong retort clamp is ideal for clamping glassware of various sizes onto retort rods - the cork coating on the prongs provides protection from scratching vessels being held. Clamp has a 5.65" long rod which is 0.314" ( 8 mm) diameter. Adjustable Jaw capacity is 0" to 4"
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