A cutting tool assembly for boring and internal grooving operations includes a tool head having a removably secured cutting insert at a forward insert receiving end and a rear mating end with a male or female type tool holder coupler in the form of an engagement protrusion or cutting holder receiving pocket. pH of the pre-treatment compositions is from 2 to 7. Then, a second layered structure comprising at least a second substrate is provided. The base member and the joint member may be metal-bonded such that a force is added from an upper surface of the base member toward the sheath heater direction, wit the sheath heater fixed in place therebetween.