The Null Pick pickaxe is an Rare Fortnite pickaxe. Null Pick was available via the Item Shop for 800 V-Bucks and you can buy it from Fortnite Item Shop when it will listed.
Fortnite Null Pick Pickaxe Details
Careful, this one's still under development.
Fortnite Null Pick Pickaxe PNG Images
Here is the PNG images of Null Pick below!