Zagane (also called Fukurin) are the metal fittings attached to the itomaki holes. The idea is that the metal of the Zagane prevents the wood from wearing down. More importantly though, they look cool! Note: These Zagane require a reamer with a 7 degree taper for a perfect fit. It’s possible to use other reamers (like cello reamers for example), but you might have to fill in gaps with wood filler.