Fatmingo Snap Off Blades Auto-lock Slim Utility Knife 9mm with 10 Extra Replacements (Silver/Blue/Pink/Yellow Pack of 5) Snap off retractable razor blades knife designed to be lightweight and easy to carry and use Box cutter utility knives are mostly used for home, office, factories, warehouses, construction projects, cut tape, cord, strapping, cardboard, or other packaging material Easy snap-off blade provides many new cutting tips, keeping sharp cutting Safety blade lock allows you to lock in the blade at the measurement you need, to obtain a great cutting stability, we suggest not to extend the blade too long KINDLY REMIND: Please keep them away from children to avoid any hurts