Round cutting insert with reverse anti-rotation feature

A cutting tool assembly, comprising:

• a tool body having an insert receiving pocket with a projection;
• an insert received in the insert receiving pocket, the insert having a first portion having a first outer surface that terminates generally outwardly in a first cutting edge and terminates generally inwardly in a first inner edge;
• a first inner surface extending generally inwardly from the first inner edge toward a non-cylindrical opening that extends axially through the cutting insert;
• a plurality of first dimples formed in the first inner surface between the first inner edge and the opening, each of the plurality of first dimples includes a bottom surface and a tapered sidewall extending from the bottom surface to the first inner surface;
• and a generally circular side surface that extends between the first outer surface and the second outer surface,
• wherein one of the plurality of first dimples cooperates with the projection of the insert receiving pocket to prevent rotation of the insert when mounted in the insert receiving pocket, and
• wherein the insert further comprises a second outer surface that terminates generally outwardly in a second cutting edge and terminates generally inwardly in a second inner edge;
• a second inner surface extending generally inwardly from the second inner edge;
• and a plurality of second dimples formed in the second inner surface between the second inner edge and a central opening, wherein one of the plurality of second dimples cooperates with the projection of the insert receiving pocket to prevent rotation of the insert when mounted in the insert receiving pocket.