PHC® S4SR™ Guarded Auto-Retract Safety Knife Auto-Retract Safety Knife features a safety point blade that retracts once the cut is completed. The fixed steel guard will not flex, bend, or break. It has five blade depth positions, and the angle of the blade is set specifically to avoid damaging the box contents. Users also find that utilizing the heavy duty tape splitter while opening boxes further prevents injuries and extends the life of the blades. Tool free blade change. Includes one SP-017 Safety Point Blade and holds 5 additional blades. Unique color coding for left and right hand users