Cutting insert and tool and wrench for using the same

A cutting insert, comprising:

• a blade-shaped construction with lower and upper bearing surfaces for being held in an elongated cutout having lower and upper opposing surfaces in a basic tool body of a grooving and cut-off tool or disk milling cutter;
• a plurality of consecutively disposed, interlinked individual cutting inserts to be brought into use successively by detaching a respectively preceding individual cutting insert at a respectively interposed predetermined breaking point during cutting use;
• and
• each of said individual cutting inserts having a positioning device cooperating with a complementary positioning device of the basic tool body;
• and
• said positioning device of said individual cutting inserts being formed of at least one projection and/or cutout in at least one of said bearing surfaces, cooperating with the positioning device of the basic tool body having projections and/or cutouts with a correspondingly complementary construction in at least one of the opposing surfaces of the cutout;
• and
• said individual predetermined breaking points each being formed by a respective slot effecting a partial clearance of sides of said individual cutting inserts relative to an end surface of said respectively preceding individual cutting insert.