Grindstone (GregTech 6)

The Grindstone is a block added by, used to perform Sharpener recipes by hand. To use the Sharpener, a block must first be placed inside the Sharpener, and will need to be replaced every so often. Then, while holding the item to be sharpened in their hand, the player should right click the sharpener until the item is sharpened.

The Sharpener is used to finish Raw Tool Heads created using a Mold, and to create the Crystalline Glass Lenses needed for crafting the Magnifying Glass.