NT Cutter Heavy Duty Chemical Resistant Poly Grip Multi-Blade Cartridge Knife, 1 Knife (L-700RP) Heavy duty snap off blade utility knife Multi-blade cartridge / Accommodates up to 6 blades Blade Size: 18mm Features an automatic blade lock / With screw-Stopper Glass-reinforced Polypropylene anti-slip contoured grip Stainless steel blade-sliding-track / With triangle blade snapper # of blade included: 2 Replacement blade: BL-150P, BL-10P or BL-50P (BL-3000-ON is also applicable)