CobraTec Knives CTK-1 Medium OTF Automatic Folding Knife 3in D2 Steel Drop Serrated Zinc Aluminum Alloy Army Digi Camo. The CTK-1 is one of the best out the front knife (OTF) for general use and a great choice as your everyday carry. The handle is designed from high-grade aluminum alloy and features a D2 steel blade. The knife is ambidextrous as the pocket clip can be switched to either side of the handle depending on your preference. This OTF knife features a pocket clip a glass breaker for emergencies and includes a nylon sheath. Specifications for CobraTec Knives CTK-1 Medium 3in OTF Knife: Manufacturer: CobraTec Knives Quantity: