The KUKKO 121-389 Screw Punch features a diameter of 38.9 mm, making it ideal for creating precise holes in various materials. This high-quality tool is designed for durability and ease of use, ensuring clean and accurate punches every time. Its ergonomic handle provides a comfortable grip, allowing for extended use without fatigue. Suitable for both professional and DIY projects, this screw punch is versatile and reliable. Enhance your toolkit with this essential tool, perfect for woodworking, leatherworking, and other applications requiring precision hole creation.