Made of cobalt for durability, the triangle post is more sturdy and practical with a case for easy storage and carrying. Great Drilling Tool Application: Suitable for thin metal, aluminum, iron, angle steel, carbon steel, 304 stainless steel. Bring a case for easy storage and carrying. Made of cobalt, it is strong and durable. Triangle posts are more sturdy and practical. Great Drilling Tool Due to manual measurement, please allow an error of 1-2 cm. Please make sure you do not mind before you bid. Due to the light in which the photo was taken, the actual color may vary slightly from the photo shown. No center punching required: The fast cutting points are automatically centered, allowing quick access with just a little pressure, providing a stable drill in all conditions. Metal cutting: Drilling steel, stainless steel, hard metals and iron. Although they can also be used on softer materials, they are particularly suited to cutting hard metals such as stainless steel and cast iron. Our HSS twist drills are made from M35 cobalt steel with the addition of molybdenum and cobalt to form a hardened alloy. .