Size 4. Drilling range 24.0-40.0 mm. This robust tool allows for centering, pilot drilling, and continuous enlarging of sheets in a single operation. The deeply ground flute ensures absolute smoothness and high cutting performance. The cone facilitates retraction when drilling through sheets. This sheet metal step drill is designed for high demands in industry and craftsmanship. The titanium nitride wear protection coating increases surface hardness to approximately 2,300 HV and heat resistance to about 600 °C.