Twin Blade Knife, 2 Knives In 1, Ergonomic Handle Design For Comfort, Control & Balance For Extended Use, Retractable Blades Controls Cut Depth & Safely Stores In Knife When Not In Use, Blade Changes With The Push Of A Button, No Tools Required, Swing Out Blade Storage Holds Up To 9 Blades, Padded Thumb Rest For Comfort. Patented Safety Lock Allows Only 1 Blade To Be Extended At A Time, Accepts All Standard, Heavy-Duty, & Hook Blades.