Heavy-Duty & Lightweight Utility Knife : Aluminum alloy and stainless steel design with rust-free powder-coat makes the box cutter durable and lightweight (0.7 oz), passing the 1.5m drop test. SK5 razor blades through 1922 °F heat treatment are up to 64 HRC. For long-lasting, extremely durable cuts and slices on boxes, plastic packaging, and straps. Retractable Blade & Auto-lock : The multiple locking grooves allow a free control of blade length with sharp precision. The blade automatically locked when free the button and easily retracts to lock safely within the metal frame when finished using. Razor blade replacement is easy with the quick-release retail. Includes 10 extra blades. Sharper Acute Angle Great for General & Precision Cutting : Slice through cardboard, carpet, drywall, rope, vinyl, leather, flooring. Use for box cutter tool and exact cuts for arts & crafts or hobby. Makes a Great Gift for the practical people on your list! Human & Environment : Hand-friendly body and ergonomic design upgrade your user experience. Materials comply with environmental protection, the total content of three o-phenols less than 1000 ppm Trusted Quality : Manufactured by a globally recognized tool supplier, ensuring consistent performance and reliability #Note# : It may be dangerous in the pocket. WORKPRO Premium Utility Knife Retractable Snap-off blade, Heavy Duty Metal Box Cutter Set, Razor Knife Exacto Craft Knives, with 10 Extra Blades, Pack of 5