A diz is used as a final step in preparing fiber for spinning. You can pull carded fiber though one of the holes to create roving for example. I also keep other shapes and woods in stock.
I make tools to easily start the fiber in the diz hole. The threading tool, or threader, is sold as a set with these diz and features a 1" wrap per inch measure on its handle.
Threader Tool Use to thread your spinning wheel, diz, or other suitable tasks. If you have any trouble with the wire threading part let me know please, firstname.lastname@example.org
Threading tools are available in a variety of woods. Maple and Tulip Poplar are also in stock in addition to the Cherry and Walnut shown above. I will provide detailed pictures and dimensions as needed if you are interested.