All kind of Sun shapes is base for most fences in Slovakia. This one is from locality Dvory nad Žitavou form middle south of Slovakia.
You could choose form three sizes:
size 51 ‒ circumference 51 mm ‒ diameter 16.2 mm
size 53 ‒ circumference 53 mm ‒ diameter 16.9 mm
size 55 ‒ circumference 55 mm ‒ diameter 17.5 mm