The drill bit is made from HSS / M35 steel according to DIN338, containing 5 percent cobalt content. Its is, anti-abrasion good heat resistance, no rust. The product not only helps to drill common iron and steel but also can drill large hardness materials. Tolsen iron helical bevel helix design makes drilling fast, easy. The sharp drill bit for smooth round hole, smooth, not spangle or rough, create aesthetics for the product that you want to manipulate.