【Upgrade Kit】Our leather hole puncher comes with 2 extra copper washers, a screwdriver, a ruler, and a grinding rod. The burr can be removed from the hole puncher with the grinding rod to resharpen the punch; The precise length and hole diameter can be determined quickly and easily using the digital display and ruler; And the screwdriver is suitable for replacing the copper plate and screws on the leather. 【Ergonomic Design】The professional punch bar has a double lever to save too much force in your hands when in use. This makes it very easy to grip when in use and clamp when drilling, even if you suffer from aching limbs. Thanks to the padded handles for non-slip and ergonomic properties, it does not cause sores or blisters. Nevertheless, it is your ideal option for long-term repetitive work. 【Multifunction】The rotating punch bar comes with 6 different hole diameters: 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, and 4.5 mm. Therefore, it is suitable for art and craft enthusiasts and DIYers. Ultra-large punch provides better stability and control, applicable to leather, plastic, canvas, paper, rubber, polyurethane, fabric, silk, and other similar materials and good durability. The metal surface has been treated with spray paint to avoid oxidation. The copper plate is thickened to ensure safety.