Stepladder

The Ladder is an environment-active item, meaning it is used automatically when Link's environment allows for its use. There is no need to "equip" or "use" the item.

The Ladder is the quest item claimed from the Fourth Labyrinth in the first quest. (Not until 6th in the second quest). It is used to traverse small (one-square) spans of water that would otherwise block Link's progress.