COAST's new FDX300 and FDX302 knives feature the company's next-gen proprietary safety features. The new, imaginative locking systems are combined to make an adjustable locking system that is easy to use and provides unequaled safety. When the knife blade is opened, the Frame-Lock automatically engages which locks the blade open. For added safety, push the switch on the top of the handle forward to engage the patent pending Double-Lock system. Tough, durable FDX blades are rigorously tested for sharpness and constructed of 7Cr17 stainless steel. The blades are precision grounded, heat-treated, cryogenically treated and tempered for unmatched strength and flexibility.