WORKPRO Retractable Utility Knife and Self-retracting Safety Box Cutter 2-in-1 with 3 Extra Blades Included Top Button: Self-retracting action returns blade safely into the body when not in use Side Button: 3-position for blade locking and 1-position fully closed Ergonomic grip design, die-cast aluminum curved body design for comfort, control and balance Internal blade storage in handle holds 3 extra blades Quick change mechanism for safe, quick and easy blade changes Press the button of the blade; Release the blade; Change the blades; Accepts all standard utility blades Blade retracts once it leaves the cutting surface when the blade is in the 4th position 4 position retractable blade Blade storage area in handle for 3 extra blades Ideal for cutting pipe, paper, arts and crafts and other DIY applications