Worksite Utility Knife Box Cutter,18mm Highly Durable and Efficient Utility Knife, Stainless Steel Auto Replacement Blade. Strong Plastic Cover is Comfortable to Hold. Made with the Highest Quality Material and Craftsmanship. Comes with 3 – 18mm Stainless Steel Blades. Retractable, Compact, Extended Use for Heavy Duty Office, Home, Arts Crafts, Hobby for Cutting Boxes, Cartons, Cardboard. WT6068