The Olfa Flex-Guard Safety Knife, SK-6 provides extra piece of mind for the safety conscious person.With an automatic protection system that engages the moment the blade loses contact with the cutting surface. The built in safety protection is activated as soon as you start cutting and cannot be overridden. The Rounded Safety Tip Blades help further reduce the possibility of injury to yourself or the products inside the box. The SK-6 is great for left-handed or right-handed users and cuts to a depth of 0.39"; 10mm. Good For: cutting corrugate boxes, cartons, packaging material, etc.