Custom Pickaxes

This is a simple plugin about different types of pickaxes, also, this is my first plugin (that I published) so please give me feedback, even be harsh, I don't care.

All of these will be based on the normal pickaxe crafting recipe:
Emerald Pickaxe: 3 emerald blocks on top, 2 sticks down the middle
Sharp Pickaxe: 3 iron swords on top, 2 sticks down the middle
Converter pickaxe: one iron block, one coal block, and one copper block n top, and 2 sticks down the middle
WoodCutter: 3 oak logs on top, 2 sticks down the middle
FastPick: 3 diamond blocks on the top, 2 sticks down the middle