GEO Knife Belluf GEO2508I M390 Blade Titanium Handle Crossbar Lock Folding Knife

The GEO Knife GEO2508I combines exceptional craftsmanship with premium materials for serious EDC enthusiasts. Featuring a Böhler M390 stainless steel blade—renowned for extraordinary edge retention and corrosion resistance—this folding knife delivers uncompromising performance. The 6AL4V titanium handle with crossbar lock ensures durability and ambidextrous operation, while ergonomic design guarantees a secure grip in any condition. At just 85.3g, this lightweight utility blade excels in outdoor, camping, and daily carry applications. The stonewash drop-point blade (HRC60-62) maintains a razor-sharp edge through extended use, though sharpening requires diamond abrasives due to its extreme hardness. Designed by Fabian Hobbelen, this precision instrument represents the pinnacle of folding knife engineering.

M390 Blade Introduction

M390 is an advanced powder-metallurgical stainless steel utilizing high chromium and vanadium content to deliver exceptional wear resistance and industry-leading corrosion resilience. It excels at retaining a razor-sharp edge under prolonged use; however, this extreme hardness renders the blade notably difficult to sharpen or reprofile without diamond abrasives. Additionally, its fine microstructure, while offering superior edge stability, sacrifices some structural toughness and may be more prone to chipping under heavy lateral stress.

Specification

Model: GEO2508I
Product Type: Folding Knife
Brand: GEO
Overall Length: 5.7 inch / 145mm
Blade Length: 2.4 inch / 60mm

Handle Length:  3.3 inch / 85mm
Handle Thickness: 0.4 inch / 10mm
Blade Width: 1.1 inch / 28 mm
Blade Thickness: 0.1 inch / 3.1mm
Blade Material: Bohler M390

Heat Treatment: Vacuum & Cryogenic
Blade Hardness: HRC60-62
Blade Type: Drop Point
Blade Finish: Stonewash
Blade Grind: Flat

Handle Material: 6AL4V Titanium
Lock Type: Crossbar
Dexterity: Ambidextrous
Washers Material: Bronze Washers
Back Spacer: N/A

Clip Material: 6AL4V Titanium
Clip Position: Tip-up, Right
Pivot Cap: 6AL4V Titanium 
Pivot Collar : Titanium
Screws Material: 6AL4V Titanium

Item Weight: 3.01 oz / 85.3g
Designer: Fabian Hobbelen
Country of Origin: China

GEO Knife Belluf GEO2508I - Product Overview

The GEO Knife Belluf GEO2508I is a compact 145 mm gentleman's folder by Fabian Hobbelen, built around a wide Bohler M390 drop-point blade, Olive anodized 6AL4V titanium scales and a smooth crossbar lock action. See every GEO Knife release and the rest of our folding knives at EDCMALL.

GEO Knife Belluf GEO2508I - Bohler M390 - Super Steel Built to Outcut the Field

Bohler M390 is the reason this knife holds its edge weeks longer than a mid-steel folder. The third-generation powder-metallurgy stainless from Austria carries a dense carbide population that resists abrasive wear at 60-62 HRC, yet its 20 percent chromium matrix still cleans up like a true stainless after food prep or rain. GEO hardens every blade under vacuum and cryogenic treatment, then finishes each one to stonewashed. The trade-offs are honest: M390 wants diamond abrasives when it finally does need sharpening, and it chips rather than bends under prying - treat it like the precision instrument it is and it will outlast several lesser knives. Combined with titanium, bronze washers and a 6AL4V titanium clip, the GEO2508I is built as a buy-once-carry-for-years working tool.

GEO Knife Belluf GEO2508I - Core Selling Points

• Bohler M390 blade at 60-62 HRC - exceptional edge retention with genuine stainless corrosion resistance.
• Ambidextrous crossbar lock - spring-bar lock is fully ambidextrous and keeps fingers clear of the blade path.
• Olive anodized 6AL4V titanium scales contoured to a 85 mm handle that grips far larger than its footprint.
• Bronze washers at the pivot deliver a smooth, detented opening that will not go gritty with pocket lint.
• 6AL4V titanium pocket clip, tip-up right carry, rides deep and low in the pocket.
• Flat-ground 60 mm drop point handles cardboard, food prep and rope without wedging.
• 85.3 g on the scale - a shorts-pocket or dress-pants folder that never prints.
• Vacuum and cryogenic heat treatment for full hardness conversion and long-term dimensional stability.

GEO Knife Belluf GEO2508I - Where It Earns Its Pocket Time

• Daily pocket carry - at 85.3 g and 145 mm closed-friendly footprint it rides unnoticed until needed.
• Warehouse and cardboard duty - M390 edge retention shrugs weeks of box cutting between touch-ups.
• Camp kitchen and food prep - stainless steel cleans up after acidic food without staining.
• Weekend trail and EDC errands - the crossbar lock opens and closes with either hand in any weather.
• Desk and dress carry - the 145 mm closed frame and deep-carry clip vanish under a shirt hem.

Frequently Asked Questions

Is Bohler M390 worth it over cheaper steels?

Yes, if you cut daily and hate sharpening. M390 holds a working edge roughly three times longer than 8Cr13MoV-class steels and still resists rust; the cost is slower sharpening on diamond plates.

How does a crossbar lock work?

A spring-loaded bar spans the handle and wedges behind the blade tang when it opens. Pull the bar back with your index or middle finger and the blade folds shut - fully ambidextrous, no liner to flex.

Is the GEO2508I legal to carry?

Folding knives with a manual crossbar lock are legal to carry in most jurisdictions, but blade-length rules vary - check your local law before carrying.

Does the titanium handle scratch?

Anodized titanium develops honest carry marks over time; the oxide layer beneath stays corrosion-proof. Stonewashed and dark finishes hide wear best.

What sharpening setup works for M390?

Diamond or CBN stones from 320 to 1000 grit, then a 3000-grit ceramic or leather strop. Conventional aluminium-oxide stones barely cut 60-62 HRC steel.

GEO Knife Belluf GEO2508I - Steel Comparison Table

Steel	Typical HRC	Edge Retention	Corrosion Resistance	Toughness	Sharpening Ease
Bohler M390 (this knife)	60-62	Exceptional	Excellent	Good	Difficult (diamond)
CPM-20CV	59-61	Exceptional	Excellent	Good	Difficult
CPM-S35VN	58-60	Very Good	Very Good	Better	Moderate
14C28N	59-61	Good	Excellent	Good	Very Easy
D2	58-61	Very Good	Fair (oil it)	Good	Moderate

Glossary of Key Terms

Bohler M390
A third-generation powder-metallurgy stainless from Bohler loaded with chromium, vanadium and molybdenum carbides. At 60-62 HRC it holds a working edge longer than almost any other production knife steel and still resists corrosion like a true stainless.

Crossbar Lock
A spring-loaded steel bar that spans the handle and wedges behind the blade tang. It is fully ambidextrous, keeps your fingers out of the blade path on closing and is among the strongest folder locks in production.

6AL4V Titanium
The Ti-6Al-4V aerospace alloy used for GEO's scales, clip, pivot cap and screws. It is roughly 45 percent lighter than steel, completely corrosion-proof and takes a hard, wear-resistant anodized surface.

Bronze Washers
Phosphor-bronze pivot washers that give a smooth, controlled opening and shrug off pocket grit far better than bare titanium-on-steel contact.

Drop Point
A convex spine that sweeps down toward a strong, controllable point - the default all-round blade profile for hard-use EDC.

Flat Grind
Blade flats that taper in a straight line from the spine to the edge. It slices better than a hollow grind and stays much tougher behind the apex.

Vacuum and Cryogenic Heat Treatment
A two-stage quench: vacuum hardening prevents decarburization and scale, then a deep cryogenic cycle converts retained austenite so the steel reaches its full hardness and dimensional stability.

HRC
Rockwell Hardness C scale: the industry standard for reporting blade hardness. Higher numbers mean a harder, more wear-resistant edge that is also less forgiving of lateral load.

Stonewash Finish
A tumbling process that bead-blasts the steel into a uniform matte grey. It hides carry scratches and kills glare far better than a satin finish.

GEO Knife Belluf GEO2508I - Who Should Buy / Who Should Skip

Who Should Buy

• You carry a knife every day and want edge retention measured in weeks, not days.
• You want one ambidextrous folder both left- and right-handed users can run safely.
• You collect M390 Titanium builds and want the whole GEO Knife line covered.
• You need a lightweight EDC that still punches above its weight in hard cutting tasks.
• You value titanium hardware, bronze washers and cryogenic heat treat as long-term reliability cues.

Who Should Skip

• You pry with your knife - M390 chips laterally; a tougher 3V or Nitro-V blade is the better beater.
• You sharpen on budget oil stones only - 60-62 HRC steel needs diamond abrasives.
• Prefer heavy over-built knives - at 85.3 g this folder prioritizes light carry.
• You need a knife for saltwater daily use - rinse discipline is still required despite stainless steel.
• Your local law caps blades below this model's length - check the specs before ordering.

GEO Knife Belluf GEO2508I - Care & Maintenance

1. Wipe the titanium scales with a dry microfiber cloth; anodized colour is a surface oxide layer that scuffs under grit.
2. One drop of quality knife oil at the pivot and crossbar contact points monthly, then cycle the action to spread it.
3. Blow pocket lint out of the handle channel with compressed air before oiling so grit never grinds inside the pivot.
4. Sharpen on diamond or CBN plates; at 60-62 HRC conventional stones barely cut Bohler M390.
5. Use light, consistent strokes and finish on leather - heavy pressure chips a hard, thin apex.
6. Clean the titanium with warm water and mild soap only; solvents and bleach discolour anodizing.
7. Never pry, twist or lateral-load the tip; a 3.1 mm blade at 62 HRC chips before it bends.
8. Keep the crossbar track clean; a lint-packed omega spring channel causes sluggish, gritty deployment.
9. Re-torque clip and body screws with the correct Torx driver - titanium fasteners gall if you overtighten them.