NT Cutter Heavy-Duty ABS Anti-Slip Contoured Grip Screw-Lock Utility Knife (L-550P) Heavy duty snap off blade utility knife ABS anti-slip, deep-toothed contoured grip Blade Size: 18mm Screw-Lock system Stainless steel blade-sliding-track / With built-in blade snapper # of blade included: 3 Replacement blade: BL-150P, BL-10P or BL-50P (BL-51P, BL-3000-ON, BSL-11P, BSL-21P and SAW-5P are also applicable) Made in Japan