The TPMT insert is primarily used as the cutting element in deep hole drilling systems, directly engaging in the cutting process to remove workpiece material and form precision bore holes, cooperating with guide pads to guarantee stable drilling performance. It is typically used in combination with BTA deep hole drill bodies and shanks, indexable deep hole drill heads, to realize stable chip removal, high hole straightness and good surface finish, especially crucial for medium & large diameter deep hole machining with moderate length-to-diameter ratio. It is suitable for automotive components, mold and die manufacturing, hydraulic cylinder parts, oil & gas equipment, aerospace components and general mechanical processing.