Stanley 10-099 6 in Classic 99 Retractable Utility Knife, 1-Pack Interlocking nose to hold blade securely Three-position retractable blade Blade storage in handle,Blade is stored inside the the body of the knife. Multi-position blade slide Includes three 11-921 Heavy Duty utility blades Starts sharper and stays sharper than standard heavy-duty blades 3-position, retractable blade; blade storage in handle Patented interlocking nose holds blade securely Includes 3 blades Stanley's limited lifetime warranty