A stone-carving chisel with a straight, toothless cutting edge used for refining planes, edges, and surfaces.
A flat chisel has a straight cutting edge without teeth. After roughing and tooth-chisel work, the sculptor uses it to refine planes, articulate edges, remove tooth marks, carve details, and prepare a stone surface for abrasives or a deliberately tooled finish.
Etymology
English tool name; comparable to French ciseau droit.