I had a tea steeper (strainer) from a teapot that was never used, and wanted to use it in a mug. This holder sits on top of a mug, resting on the spokes, and the inner 6cm hole is just large enough for the steeper.Note: One of the photos is of a previous version.This is sized for a 12cm outer diameter and a 6cm hole in the middle for the strainer. You can change these settings in the OpenSCAD file.