A central part of every viking shield, buckler or even some tower shields. Also called the umbo, or just boss, it was used to deflect blows aimed at the centre of the shield, as well as offered space to mount the shield’s grip.
This shield boss is made of 2mm thick carbon steel. The bowl is 15cm in diameter and 6cm deep. The brim is 2,5cm wide with 6 holes for bolts or nails.