The 1/2 inch HSS twist drill bit is a spiral drill bit suitable for drilling metal holes. This DIY tool is for use in stainless steel, iron, copper, aluminum, wood, and plastic. Yaowanguan HSS twist drill bits are made of high-quality, high-speed steel with a special sharpening technology, resulting in high hardness and a cleaner opening. The Yaowanguan HSS twist drill bits have a double posterior horn, which improves positioning accuracy and reduces resistance, making the drills more durable and efficient. The Yaowanguan HSS twist drill bit is suitable for electric drills and bench drills, and is widely used in home decoration, DIY projects, and other applications for drilling stainless steel, iron, copper, aluminum, wood, and plastic. It is recommended to add water when using the drill bits.