CrewSafe X-TRASAFE cartridge knife. Design to be a safe alternative to standard utility knife replacement blades and to reduce the costs of employee injuries from loose blades in the work place, this box knife is a perfect go to tool for non food items (and even some food items. The increased safety of this knife is achieved by the spring activated blade guards that protect users by closing after each cut and the manual guard lock that ensures cartridges do not cause laceration injuries. Further, this knife features a stainless steel blade that resists corrosion and breakage, a non-fatiguing lightweight handle, and a high visibility color cartridge. Kit includes 4 Assembled Knives & 8 Replacement Cartridges. - Stainless Steel - Sold per kit