What You Get: the package includes 50 pieces of silicone grommets for hole of approximately 0.4 inches/ 10 mm, suitable for stainless steel or silicone straws, the ideal match for your cups or strawsFits 12 mm Hole: the hole grommets silicone white are suited for mason jar with 0.47 inches/ 12 mm holes, or other jars lids that have about 0.47 inches/ 12 mm holes, you can punch your own holes if you want, make sure the

size is correctVersatile Application: the silicone gasket can be applied as a straw hole plug for mason jar lid, also suitable as mason jar fermentation airlock lid, for sauerkraut and kimchi fermentors, home brew wine and beer making barrel fermentationIdeal for 8 mm Standard Straws: this straw hole collar has a hole with diameter of about 0.4 inches/ 10 mm; When utilized as a mason jar lid straw hole plug, it is suited for standard straws with an outside diameter of about 0.32 inches/ 8 mm, because straws larger than 0.4 inches/ 10 mm may deform the siliconeSafe and Long Lasting: the silicone gasket can be washed in water before first usage; It is dishwasher safe, reliable and reusable, you can apply them for multiple times is you preserve them with care Features: The silicone o rings are easy to install and remove. Just put the grommet into the opening such that the grommet groove catches on the edge, just punch or drill a hole in the mason jar lid. The high temp silicone grommet will transport or store your beverage conveniently, close the straw hole. And it can withstand high temperature. Specifications: Material: siliconeColor: whiteSize: Inner diameter: about 0.40 inches/ 10 mmOuter diameter: about 0.67 inches/ 17 mmPackage includes: 50 x Silicone gasketNotes: Manual measurement, please allow slight errors on size. The

color may exist a slight difference due to different screen displays.