3/4" x 3/16" and hole size of 1/8".
The 1/8 Inch Wooden Dowels fit these wheels.
Also shown below with the larger wooden wheels and the Hinged Wood Chest with Clasp (both linked below if still in stock).
Set of 4.
Bird Toy by Design Team Member Kristin Batsel (with some artful coloring and distressing via Copic Markers and sandpaper). See the Supply List.
For more information see the blog.