Spoiler warning: Quest and/or game spoiling details follow. (Settings
: hidden content)
Can be gotten through the Secret Service Quest
This item can be used to open 500 Loose Stone Piles in order to gain the The Undertaker achievement.
This item can also be used to cut Jungle Grass 100 times in order to gain the Nothing Can Stop Me achievement.
Can also be used to cut fruit for Decorated Cakes
in order to gain the Piece of Cake
and With a Cherry on Top
Spoiler ends here.