High-performance countersink tools with a countersink angle of 90° for sinking 90° screws into particularly tough and hard materials such as alloyed and high-strength steel as well as stainless steel. For secure torque transmission, conical countersinks with a diameter of 28 mm and above feature a three-flat shank. Thanks to the HICOAT HC-FEP coating, they offer high hardness and wear resistance. They are highly temperature-resistant and have an exceptionally long service life. They can also be used in higher cutting speed ranges and without cooling and lubricating agents.