The Sheffield? Utility Series 12119 quick change 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, 5 of which are stored ready in the handle and a bonus 6th blade in the blade holder. For even more attributes, this Sheffield? Lock Back? knife is constructed of a lightweight ABS handle for maximum grip and comfort 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.