Change blades quickly, no screwdriver required, with the 6-3/8 in. Quick Change Retractable Utility Knife. Ideal for just about any cutting application, this knife features a 3-position retractable blade slide and a swing-out blade storage magazine. This knife maintains its usefulness even when closed with an integrated string cutter that can be used when the blade is retracted. Includes (3) heavy-duty blades.