The Groz - Spare Blades Retractable Utility Knife is made of an alloy of steel to provide improved shelf life and prevent the blades from getting blunt too quickly when the knife is used almost every day for small operations of cutting different objects and packing materials of machine parts. The Spare Blades Retractable Utility Knife has a length of 35 mm, a width of 105 mm, and a height of 259 mm when it is concerned with the blade, which is well protected with the help of an outer coating of plastic to prevent cuts and scratches while using the utility knife. In addition, the Retractable Utility Knife is very sharp and serrated at the edges with a lot of small bumps.