Our Sheffield Utility Series Ultimate Lock Back Folding Utility Knives feature a one-hand opening operation for ease of use, allowing you to cut through all obstacles - such as paper, cardboard, rope, carpet, and it makes a fantastic Sheetrock knife. This Sheffield Utility Knife also boasts a quick-change mechanism for quick and easy utility knife blade replacement. It conveniently uses standard utility knife blades (don't forget Sheffield sells some of the best razor blades for box cutters around). This knife is superior to just about any retractable box cutter or any of the shop knives you could find out there. You'll love the feel of the textured aluminum handle, and the convenience of the easy open, easy close action. And with the included high quality leather sheath, your new favorite knife will always be close at hand. COMPARE OUR KNIFE WITH YOUR OLD UTILITY KNIFE: If you're looking for a new box or carpet cutter that's less hassle and maintenance than your old razor knife, the Sheffield Ultimate Lock Back Utility Box Knife is that knife.