Extrema Ratio BD4 Lucky is a semi-serrated folding knife with a guard. The BD4 Lucky perfectly combines the elegance of classic Italian style with the functionality of a day-to-day folding knife. The guard also acts as a flipper, and the high-speed auxiliary knife opening system makes it easy to use. The ergonomic tan-colored handle uses anodized aluminum alloy and the stonewashed streamlined blade is made from Böhler N690 cobalt steel..
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