NT's cartridge-type, heavy-duty snap off blade knife has a heat and chemical resistant polypropylene anti-slip contoured grip. Holding up to 6 refill blades, this cartridge type multi blade knife is convenient for jobs that require constant supply of new blades. Just remove the old blade and a new blade will automatically pop up into position. Convenient snap off utility knife has an extra high quality stainless steel sliding track which allows the blade to glide in and out smoothly. Ratchet Auto-Lock slider with added screw-stopper to insure that blade will hold securely in position for maximum cutting efficiency. The blades used in this professional snap off knife are made from high quality carbon tool steel and produced through multiple stages of precise process to obtain the ultimate sharpness and optimum edge-retention. This cartridge knife comes with two carbon steel blades and a triangular blade snapper. Good for DIY projects, construction such as drywall, roofing, flooring, Industrial application, warehouses, factories, etc.