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Folding knives

FERRUM E BLACK

Name: FERRUM E BLACK
Brand: Extrema Ratio
SKU: 04.1000.0366
Price: 195.08 EUR
Availability: InStock

€195.08

Ferrum E is a simple, essential and functional EDC (Every Day Carry) folding knife. It has a drop point blade and a slim and compact shape. The two anodized anticorodal aluminum handle scales make its grip light, slim as well as resistant. It can be placed in a pocket, in small flashlight holsters or in a single M.O.L.L.E. system webbing.

Handle

BLACK
TACTICAL MUD

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Description

It comes with a flipper assisted opening. The blade rotates on ball bearings resulting in a fluid and firm movement.

This mechanism allows the user an easy and rapid opening of the blade, even with just one hand. The locking mechanism is the time-tested liner lock. The reversible clip is located on the back.

Ferrum E is available in two versions, both with satin blade finishing. Ferrum E Black has a black grip; Ferrum E Tactical Mud comes with a brand-new anodized grey-green handle finishing.

Use

PROFESSIONAL OPERATIONAL DEPLOYMENT

Extrema Ratio develops knives engineered for real-world applications, where control, precision, and reliability are essential requirements. Every model is designed to ensure stable ergonomics, proper balance, and consistent performance, even during prolonged use. Use the tool strictly according to its technical function, avoiding improper use or stress beyond its intended scope. Mindful use preserves safety, efficiency, and longevity, keeping structural and operational characteristics of the product intact.

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Care

ESSENTIAL ROUTINE MAINTENANCE

Regular maintenance is fundamental to preserving the efficiency, reliability, and lifespan of your product. After each use – especially in the presence of salt water, humidity, mud, or grease residues – rinse with fresh water, dry thoroughly, and apply a suitable lubricant to metal parts and moving mechanisms. Periodically inspect the inside of the sheath, removing sand, dust, or abrasive particles that could damage the blade finish when sheathing or unsheathing.

Want more information? Check the complete guide.

Warranty

OFFICIAL ASSISTANCE AND WARRANTY

Extrema Ratio knives are covered by a lifetime warranty covering defects in workmanship, materials, or treatments that compromise functionality. Sheaths are guaranteed for two years from the first documented purchase. Upon verification of a recognized defect, the product will be professionally repaired. If non-restorable, the tool will be replaced with an identical new product. Should the specific model be unavailable, it will be replaced with the most similar product in terms of technical features and overall value to ensure your complete satisfaction.

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