Stanley, Quickslide 3 Sport Utility Knife, Features A Sliding Utility Blade For Precision Cutting As Well As A Lock Back Sport Knife For Tough Cutting Jobs, The Utility Knife Features A Quick "No Tools" Blade Change, Allowing Users To Replace An Old Blade With Any Standard Stanley Utility Or Hook Blade, A Patented Interlock Mechanism Prevents Both Blades From Being Open At One Time, Cast Zinc Body For Increased Durability.