General description This 150-piece Drillforce Tools M35 Cobalt Drill Bit Set is designed for drilling through hardened steel, cast iron, and stainless steel. Made from a cobalt steel alloy, these drill bits offer enhanced strength and heat resistance, making them ideal for tough materials while still being suitable for softer ones. Technical specifications Material: Cobalt steel alloy (M35 grade, 5% cobalt) Drill bit sizes: 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm (30 pieces of each size) Point angle: 135 degrees Measurement allowed error: +/- 1-3cm Usage Recommended for drilling stainless steel and cast iron Cooling liquid is required to prolong the working life of the drill bits and to avoid overheating and breakage Handle with care, as smaller bits are more likely to break than larger ones Other information Note: Light reflection and different displays may cause the color of the item in the picture to differ slightly from the actual product