Modeling Tool With a Flat Blade

Word Meaning:

CHISEL — A cutting tool used to remove parts of stone, wood or metal by pushing or pounding the back when the sharp edge is against the material. It consists of a slim, oblong block of metal with a sharp wedge or bevel formed on one end and sometimes a handle at the other end; there are hand tool versions (the original type) and versions as bits for power tools.

Definitions from Wiktionary.