Metal cutting tool

A metal cutting tool comprising:

• an insert holder formed from a single continuous piece of material that includes an insert pocket having a lower support wall and an upper support wall, the lower and upper support walls defining an acute angle (α) therebetween;
• and
• an indexable cutting insert, comprising two opposing side surfaces, and a peripheral edge surface extending therebetween and having an insert axis of rotational symmetry passing through the side surfaces;
• the peripheral edge surface having a plurality of abutment sections, each abutment section lying on a portion of a side wall of an imaginary regular polygon having a plurality of side walls, a plurality of cutting portions extending outwardly from the imaginary polygon, the plurality of cutting portions being equal in number to the number of side walls of the imaginary polygon, each cutting portion having a cutting edge, each abutment section being located between two cutting portions;
• wherein:
• the cutting insert is retained in the insert pocket with the peripheral edge surface being abutted at only two of said abutment sections with a first of said abutment sections being abutted by the lower support wall and a second of said abutment sections being abutted by the upper support wall.