- Punch Drill Specifications: - Punching Lengths: 33mm (1.3 inches) and 21mm (0.83 inches) - Punching Diameters: 3.5mm (0.14 inches) and 2.5mm (0.1 inches) - Shank Diameter: 11mm - Total Length Options: 70mm (2.75 inches) and 65mm (2.56 inches) - Versatile Applications: Ideal for punching tags, wall calendars, desk calendars, books, and handbags. Compatible with various materials including ordinary paper, offset paper, coated paper, grease film paper, leather, and fabric. - Exceptional Features: Crafted for durability with overall quenching, ensuring high hardness and resistance to breaking. The 90-degree inner chamfer opening enhances edge sharpness and strength, reducing resistance by 80% compared to traditional techniques. Designed to minimize jamming during operation. - User-Friendly Operation: Ensure paper is placed flat for optimal punching. Regular lubrication of the punch drill is recommended for best performance. Be mindful that smaller pinholes require slower speeds for accuracy. This punch drill delivers precision and reliability for your crafting and administrative needs, making it a valuable tool in any workspace.