The board is 24cm diameter. It hangs by a picture cord across the back, plus I'm including rawl plugs and screws in case you wish to make it a permanent fixture.
... and another! ...
The board is 17.5cm wide and 28cm total length. It hangs by a macrame hook at the top.
These two mosaics each have a metal BEE hook (bought in Dunelm) for storing keys or hanging up a coat, apron, etc.
I used a jig-saw to saw the bee shapes from MDF, and added mosaic tiles, before gluing them to new wooden boards.