Safety-tipped blades retract automatically upon release of handle. Unique adjustable dial allows different blade cutting lengths, ensuring the blade isn't too far out. Prevents cutting interior items in package. Handle features retractable edge guides for cutting box tops as well as a blade storage compartment pre-stocked with three replacement blades. Knife Type: Retractable Blade Knife; Blade Type: Retractable; Number of Blades: 1; Handle Material: Plastic.