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Extrema Ratio has developed a different type of basic folder. The BD4 LUCKY features double guards that function as a quick opening system. Plus it has a handy serrated blade. A generous EDC that might not be legal in some areas. Definitely reflects Extrema Ratio's Italian styling.


The BD4 LUCKY does not have the thumb studs you commonly find on other Extrema Ratio folders. The double guards perform double duty: protecting your hand and easy opening. Streamlined spear point with partially serrated edge – very useful for EDC needs. This model has a desert handle and a stone washed blade. Tip up carry.


The BD4 LUCKY has a handle that is tapered and has Extrema Ratio's characteristic shaping to give your an enhanced grip. It has a bridge clip that folds over the end. This allows you to have a deep carry with only the clip exposed.


The BD4 LUCKY has a liner lock.

Total Length of Knife (Including Clip): mm 285.75 (11.25 inches)

Length of Closed Knife: mm 155.70 (6.13 inches)

Blade Length: mm 122.94 (4.84 inches)

Handle Length (Excluding Clip): mm 152.40 (6.00 inches)

Weight of Knife: g 133.24 (4.70 ounces)

Blade Thickness: mm 2.79 (.11 inches)

Closed Knife Thickness: mm 9.65 (.38 inches)

Blade Steel: Bohler N690 cobalt stainless steel*

Blade Hardness: Rockwell 58 HRC

Main Grind: Flat

Serrations on Blade: mm 19.81 (0.78 inches)

Lock: Liner Lock

Handle Material: Anodized anticorodal aluminum alloy **

Belt Clip: Yes

Window Breaker: No


* The blade is made with N690 cobalt stainless steel; a high performance steel with excellent cutting and sharpening characteristics. This steel is also used in the butchering industry and to make surgical instruments.

** The handle is made of black anodizes anticorodal aluminum, an aluminum alloy that is very strong and corrosion resistant.

Availability: Usually ships in 2-3 business days

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