Adjustment rings for microgreen grower

Not all wide mouth mason jars are created equal. A lot are slightly different. The microgreen growers work even if they slide inside the neck a little instead of sitting on the rim. Some people want it on the rim. These adjustment rings help do just that. If you are not sure if they will fit your wide mouth jars, you can purchase a few of these and save on shipping them by themselves. Mason jar and microgreen grower sold separately.