Self Retracting Safety Knife, 6 in Length, Bi Metal Blade, Aluminum, Red no checkout regular duty with extra deep throat Black regular duty with extra deep throat Black oxide spindles and perma pad® resist corrosion and are replaceable Innovative frame geometry for maximum strength Hand guard loop Easy to get at mechanism Cam actuated double leverage Heavy duty Self retracting spring action returns blade safely into the housing when not in use Interlocking nose reduces blade wobble Ergonomic grip fits comfortably in the hand Two blade positions 2mm extension for box cutting and full extension for general use Tool free entry