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 industry leading lifetime warranty has your back.