Did you know that there are millions of Mason jars are currently in circulation in North America? Why not find a second use for all those jars! This Oil and Vinegar Pourer for Mason Jars from Starfrit is designed to screw onto a regular Mason jar. Simply insert the dripless spout into the collar then screw it on a regular Mason Jar (jar sold separately)! The pourer is even dishwasher safe.