Classification and use of chisels:
Flat chisel: The cutting edge is flat, and the cutting edge and the chisel body are in an inverted isosceles triangle. It is mainly used to make square holes or repair some square holes;
Oblique chisel: The blade is at a 45° angle, and the blade and the chisel body are in an inverted right-angled triangle. It is mainly used for repairing, and most of it is used for repairing some dead corners of carving and carving;
Round chisel: The blade is semi-circular, mainly used to make round or oval holes;
Diamond chisel: The blade is V-shaped, which is rare now, mainly used for carving and repairing;