Unbreaking

Unbreaking is an enchantment that gives a chance for an item's durability not to be reduced when it is used, effectively increasing the item's durability.

Usage
For most items, there is a  chance that using the item reduces durability. On average, tools last times as long.

For armor,  chance a use reduces durability, meaning each durability hit against "unbreaking" armor has a 20%/27%/30% chance of being ignored. On average, armor lasts 25%/36%/43% longer.

When durability is reduced by multiple points, as when hooking a mob with fishing rods or getting hit while wearing Thorns-enchanted armor, Unbreaking is applied for each point of reduction.

ID
耐久