The Sheffield Utility Series 12613 Ultimate Lock Back Utility Knife features a one-hand opening operation for ease of use allowing you to cut through all obstacles such as paper, cardboard and more! This Sheffield Utility Knife also boasts a quick-change mechanism for a quick and easy blade replacement procedure; using standard utility knife blades. For even more attributes, this Sheffield Lock Back Knife is constructed of a lightweight aluminum handle and includes a belt clip for your convenience! So go ahead cut through twine, boxes and more with "ultimate" ease. As always, Sheffield's industry-leading Lifetime Warranty has your back.