NT Cutter Heavy-Duty Self-Retracting Safety Knife, 1 Knife (SL-3P) Heavy duty self-retracting safety knife Blade Size: 18mm Short Blade Heavy duty ABS grip / Stainless steel sliding holder / With triangle blade snapper # of blade included: BSL-11 x 1, BSL-21 x 1 Replacement blade: BSL-11, BSL-21 Cutting material: Corrugated box, plastic strapping, packages, cartons, cardboard, shrink-wrap,etc. Good for Industrial application, warehouses, factories, etc. Made in Japan