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Product Info for Plasticoid Black Rubber Stoppers, One-Hole 8--M291, Pack

These black, high percentage rubber stoppers are low in free sulfur and have a single hole to facilitate laboratory procedures. Stoppers sized as 000 through 0 have a 3mm diameter hole; the size 1 stopper has a 4mm hole. Stoppers sized as 2 and larger have a 5mm diameter hole. Remain resilient and pliable under most laboratory conditions.

Specifications for Plasticoid Black Rubber Stoppers, One-Hole 8--M291 :

Size:  8
Dia. of Top, mm:  41
Dia. of Bottom, mm:  33
Length, mm:  25
No./lb (Approx.):  14
Unit:  Pack