HTT provides a total variety of HM twist drills with two or three flutes. These units can be equipped with and without internal coolant holes (both spiral and straight) and with or without surface coatings. They are designed to bore extremely hard materials of up to 70 HRC, and tough materials like spheroidal cast iron. The units are also useful for machining in dry environment, with lengths that range from 3 to 12 x diameter, and center drills and spade drills.
HTT is also offering custom-made designs. By sending them a drawing or just a short description of what the user needs and material to be machined, they will design the appropriate instrument and solution to the machining problems.