This is a simple holder for your paint brushes when using a medium sized Mason Jar. I noticed my brushes were getting flattened on the end when left sitting in my cleaning jar. this Holder has several size holes to accommodate most smaller hobby sized paint brushes. Depending on how much water you put in your jar, will determine if the brushes sit above the water or down in the water for cleaning.. This is sized to fit a standard smaller Mason Jar with an approximate 2.5" (64mm) inside rim dimension. Just print per the image and the snap on your jar on the side where there aren't threads up high.