TEKTON 6924 Auto-Change Utility Knife Heavy-Duty and Rugged Utility Knife is Ideal for Plumbers, Mechanics, Contractors, Homeowners and DIYer's Heavy Duty Metal Housing with Comfortable Non-Slip Rubber Grips Retractable Blade Locks in Three Cutting Positions Auto-Loading Instant Blade Change from On-Board 5-Blade Magazine Quality Guarantee