Extrema Ratio BFK Folding Knives

The Extrema Ratio BFK is the full-size folding knife at the center of the BFK Series. Approximately 7.68 inches overall with a 3.27-inch N690 steel blade, it delivers substantial everyday capability while remaining familiar, balanced and easy to carry.

Its Crossbar Lock provides fast, fluid and play-free operation while keeping the user’s fingers away from the blade’s closing path. The reversible pocket clip and fully ambidextrous controls accommodate right- or left-handed carry. Available handle configurations include machined aluminum, carbon fiber, G10 and Micarta in five distinct BFK color and material combinations. This is the folder for customers who want a confident pocket knife with the fit, tolerances and reliability associated with Extrema Ratio. Compare every available BFK configuration at Atlantic Knife.