It posseses a rectangular sectioned steel blade, the size (width of blade) being 3 mm to 50 mm. It is used for general chiselling work.
Firmer Chisel
Its edges are bevelled along the length. It is used for light chiselling and to clean sharp corners where the edges of a normal firmer chisel may not reach.
Bevel-edge Firmer Chisel
It has an extra long, thin blade with the edges bevelled. It is used for paring and finishing joints.
Paring Chisel
It posseses a stronger, square sectional blade. It is used for mortising i.e. making rectangular holes in wood.