11-13mm diameter top for test tube ,Winged or flanged style
Winged style / flanged
This type of stopper is a lot more forgiving and flexible than the High Grip stoppers.
The ' wings ' will fold as you insert the top into your tube allowing a larger margin of tolerance in diameter size
It will therefore fit an 11 , 12 mm OR 13mm Diameter tubes.
If you're not sure these will fit your tube We have our sample pack of similar size tops
If you have no objections to paying the postal charges of £1.20 for a large letter just ask us for a sample pack
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