Industrial and scientific tools are essential for any production farm, and I've struggled in the past to find a product that can handle the task .As a result of using this tagging puncher/caliper, i found that it's a reliable, heavy-duty tool that can withstand heavy use. The metal construction is durable and won`t chip like the plastic models. Although the punch is initially difficult to maneuver, the aperture size is perfect for tagging ears or other livestock. Overall I highly recommend this product for any livestock owner who needs a dependable, long-lasting tool..