This Practical Tool Combines the Best Features Available in a Utility Knife, with Rugged Construction and User Safety in Mind. It Has a Bright Yellow Handle for Easy Visibility. When the Blade is Extended and Pressure is Applied to a Hard Surface, Then Removed From the Surface When Cut is Complete, the Blade Retracts Automatically and Fully Into the Housing for User Safety. the Knife Uses Standard. Klein® 44136 Utility Knife, Self-Retracting Blade, Steel Blade, 1 Blades Included, 5-3/4 in OAL