Abstract: A clamping member in a non-limiting aspect of the present disclosure may have a columnar shape extended from a first end to a second end. The clamping member may include an upper jaw, a lower jaw and a pocket. The upper jaw and the lower jaw may be located away from each other. The pocket may be located between the upper jaw and the lower jaw. The upper jaw may include a first member and a second member. The second member may be located closer to the first end than the first member. Hardness of the first member may be first hardness, and hardness of the second member may be second hardness. The first hardness may be different from the second hardness.

Abstract: A cutting insert may include an upper surface, a lower surface, a front lateral surface and a rear lateral surface. The upper surface may include a first upper cutting edge and an upper constraining surface. The lower surface may include a lower constraining surface. The lower constraining surface may include a lower groove. The lower groove may include a first region, a second region and a third region. The first region may be located on a side opposite to the upper constraining surface. A wedge angle of the first region may be a first angle, a wedge angle of the second region may be a second angle, and a wedge angle of the third region may be a third angle. The first angle may be smaller than each of the second angle and the third angle.

Abstract: A cutting insert may include an upper surface, a lower surface, a front lateral surface and a rear lateral surface. The upper surface may include an upper constraining surface. The lower surface may include a lower groove having a V-shape. The lower groove may include a first region, a second region, a third region a first portion and a second portion. A length of a line segment connecting the first portion and the second portion in the first region may be a first length, a length of a line segment connecting the first portion and the second portion in the second region may be a second length, and a length of a line segment connecting the first portion and the second portion in the third region may be a third length. The first length may be larger than each of the second length and the third length.

Abstract: A cutting insert may include an upper surface, a lower surface, a front lateral surface and a rear lateral surface. The upper surface may include a first upper cutting edge and an upper constraining surface. The lower surface may include a first region, a second region and a third region. The first region may be located on a side opposite to the upper constraining surface. The second region may be located closer to the front lateral surface than the first region. The third region may be located closer to the rear lateral surface than the first region. A wedge angle of the first region may be a first angle, a wedge angle of the second region may be a second angle, and a wedge angle of the third region may be a third angle. The first angle may be smaller than each of the second angle and the third angle.