Fine taper taps and dies make tapping easier and smoother and prevent overheating. Small and portable, easy to carry and can be used freely in a narrow space. Industrial bearing steel structure ensures maximum durability of tools. Including 20pcs of the package, meeting your different demands, wonderful tool set. All cutting teeth are processed by CNC machining and 60 HRC hardness heat treatment to achieve the best thread processing performance. Feature: 1. All cutting teeth are processed by CNC machining and 60 HRC hardness heat treatment to achieve the best thread processing performance. 2. Industrial bearing steel structure ensures maximum durability of tools. 3. Fine taper taps and dies make tapping easier and smoother and prevent overheating. 4. Small and portable, easy to carry and can be used freely in a narrow space. 5. Including 20pcs of the package, meeting your different demands, wonderful tool set.