Wide chisel (up to 8 cm) with one or two bevels, a tang and a neck, or a socket and a shank, or all metal (1).
Unlike the mortise chisel, the firmer chisel is for heavy-duty work: carving out a pin, hollowing out a drill bit hole, etc. The handle is usually fitted with one or two ferrules to prevent cracking.
Some chisels with a triangular cross-section, which often get thicker towards the handle (2), are only slightly wider than thick.
The Japanese chisel (Japanese: õire nomi), also for the heavier work, is used in a set with different widths and lengths.
See also the joiner's gouge. [MOT]
(1) See a long specimen (95 cm) in "Les moulins": 24.
(2) Eg. GROTH: 196.