Advanced Tool Kit

 is a refined material used for upgrading weapons on the Forge. This item requires Gears and Steel Balls from the Factory to craft; because the Factory cannot be obtained until mid to late game, weapons cannot be revised until fairly late in the game.

Obtaining
can be crafted using the Worktable:

Forge
is used for upgrading a weapon to the stats of another higher tier weapon of the same type at the Forge. One to five s are needed to upgrade a weapon. The number of Tool Kits used depends on the resulting stats not the weapon upgraded.

Recycle
can be placed in the Recycle Machine to produce the following items: