10 Purple Silicone Grommet 5/16" Colored Grommet BPA Free For Fermentation or Straw Lids

These multi-use food grade silicone grommets can be easily used for fermenting or homemade mason jar sippers. Drill 1/2" hold and easily insert grommet into hold. Inner grommet diameter is 5/16" and will fit most "standard" size straws. (Up to about 7mm straws, depending on how large you actually do drill your hole)