Replacement item. This standard diameter, short length glass downstem sleeve has an outside diameter of 12mil and inside diameter of 9.5mil. Various lengths available. 1.5" to 3" Please choose length. Medium and Long lengths also available. Handmade item so may be slight variation in size. Can be used with both 8mil and 9mil pull stem sliders. Comes with rubber donut grommet. 12mil is approx 1/2" TIP:Use a little soapy water when sliding rubber grommet on to downstem. Please see Glass Accessories Measuring Guide.