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TNMG-434-DM -Rake Triangle Insert ~ Widely used chipbreaker is used for semi-finishing and finishing of steel and stainless steel. ~ Has a tough cutting edge and is used for roughing/machining of internal holes and intermittent machining of work pieces with irregular surfaces. ~ Grade XAB749. ~ Has a cutting edge with strength and toughness optimally combined with an MT-TiCN, thick layer Al2O3TiN coating. ~ It is a suitable grade for a wide number of applications. ~ It is good for finishing, semi-finishing and light roughing of steel, cast steel and stainless steel. ~ ISO Insert No. is TNMG220416DM ~ I.C. is 1/2". ~ L is 7/8". ~ S is 3/16". ~ d is 13/64". ~ r is .0630.