Excel Blades K9 Retractable Utility Knife, Standard Size Heavy Duty Metal Box Cutter Knife Heavy duty, versatile utility knife with a standard size metal body perfect for cutting wood, sheetrock, and more. Strong metal frame with adjustable depth allows for versatility and comfort Retractable blade mount can support any 2, 3, or 4 notch utility blades Includes (1) Heavy Duty Utility Knife with (3) #92 Deep Hook Utility Blades