This Irish Penannular Brooch, crafted from Solid Brass, is the perfect addition to any historical wardrobe. Popular from the 4th to 10th century, it is easy to wear and features the iconic Irish Triskele design. With its solid brass construction, this brooch will stay with you for years to come.

You can see a brooch with similar knotwork terminals at the Walters Art museum.  

Another similar example is held at the MET. 

Measurements:

Inner Diameter = 5 cm

Needle Length = 7.5 cm