NT Cutter Heavy Duty Aluminum Die-Cast Grip Multi-Blade Cartridge Knife, 1 Knife (L-2000RP) 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 Aluminum die-cast grip / Electrical-acrylic metal coated / Made of recycled materials 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)