Nt Cutter Heavy-Duty Aluminum Die-Cast Cushioned Grip Auto Lock Utility Knife (L-600GRP) Heavy duty snap off blade utility knife Aluminum die-cast anti-slip cushioned grip / Electrical-acrylic metal coated / Made of recycled materials Blade Size: 18mm Features an automatic blade lock 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