Utility Knife, This Utility Knife has a sliding cartridge blade storage and push button blade release. The DuraSoft handle provides increased comfort. Sliding cartridge blade storage Push button blade release DuraSoft handle for increased comfort Cut string safely. Features: Model #: 609024. Spare blades are stored in the body. Heavy-duty Marshalltown Utility Knife. Has a tough aluminum case and a retractable blade. Replacement blades sold separately.