Retractable Utility Knives No Tools Required to Change the Blade Introducing the newest addition to the Klein utility knife family, the Klein-Kurve® heavy-duty utility knife (Cat. No. 44107). Product features include a curved handle, 10-blade storage compartment inside the handle, and a plastic holster. Klein also offers two other utility knives (Cat. Nos. 44100 & 44105). These knives both offer retractable blades and the 44105 also offers a quick change blade.
