The dials are acorn hats with pins attached to them, which are attached to the wall.
A template paper is included in the package, so use masking tape to attach it to the position where you want to install it.
The outer diameters of the template are Φ280mm, Φ260mm, and Φ240mm. The photo shows the Φ260mm template installed.
Use a pin for the bottom hole to make a hole before attaching the hat. The hat is delicate and may be damaged if it is attached with too much force.
Another feature of Mizunara's hats is the branches. Since these are natural, you cannot choose the size of the branches or whether or not to have them.
The wood is finished with oil, and the brass is unpainted, so you can enjoy the change of color over time.