The Sheffield® utility Series 12614 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.