$623.00Extrema Ratio EX0321BLK Item Description:The Extrema Ratio Ultramarine N.E.D.U. BRK-EX0321BLK is a robust, fixed-blade knife crafted for underwater operations and survival. Featuring a durable, corrosion-resistant blade, this knife is designed for demanding tasks in marine environments. The ergonomic handle provides a secure grip, even when wet, and the included sheath offers versatile carry options. This reliable tool is a valuable asset for divers, special forces, and anyone needing a dependable blade in challenging conditions.
10.88" (27.64cm) overall. 5.5" (13.97cm) black MIL-C-13924 burnished partially serrated Bohler N690 stainless blunt tip blade. Black nylon handle. Sheath comes without an upper flap. The inside-hilt blade tang undergoes a special cataphoresis process to prevent corrosion. The knife is supplied in a case with: a Cordura fabric ankle sheath, two belt clips allowing for separate use of the inner hard sheath, and a blade maintenance spray-can. Hardside carrying case.
- UPC Code: 871373542455
- Weight: 3.46 lbs
- Country of Origin: Italy
Item Category: knives
Product Number: EX0321BLK
Quantity Available: 3
(Inventory last updated December 06 2025)Estimated ship date: Tuesday December 16th, 2025
