Cutting tool insert

Polycrystalline diamond abrasive cutting element is generally made of fine polycrystalline diamond layer bonded to the carbide substrate carbide. A polycrystalline diamond layer has a working surface and an outer circumferential surface, the annular region or lacking a catalyst material adjacent a peripheral surface characterized by having a portion thereof. The area adjacent to the work surface also catalyst material is deficient, as the flaws using a wear evolves, both the leading edge and its trailing edge is located in the catalytic material lacking regions.