Chisel (GregTech 6)

The chisel is used:
 * As a crafting grid tool
 * To right-click the tops of molds to carve mold shapes
 * To right-click plates/curved plates/foil placed on the sides of machines to change their patterns
 * (pending) To right-click the top of the Coinage Mold to change the pattern of coin it mints.