Fà¤llkniven Flipstone FS4 Folding Sharpening Stone

The Fà¤llkniven Flipstone FS4 is a compact, dual-sided sharpening tool designed for those who demand razor-sharp precision anywhere they go. Resembling the size and shape of a pocket knife, this innovative flip-style sharpener easily fits in your backpack, tackle box, or pocket, making it ideal for outdoor enthusiasts, hunters, and everyday carry users alike.

Featuring two high-performance surfaces, the yellow side uses a diamond abrasive (25 microns) for repairing dull or damaged edges, while the ceramic side (1 micron) delivers a fine, mirror-like polish for ultimate sharpness. Both stones are permanently bonded together, ensuring long-term stability and reliability even after years of use.

The Flipstone’s clever automatic folding design allows you to lock it securely in both open and closed positions, adding a layer of safety and convenience. Like all diamond sharpeners, the FS4 will reach its optimal performance after sharpening around ten knives a natural process that helps the surface “break in” for consistent results.

Durable, lightweight, and built to last, the Fà¤llkniven FS4 is the perfect sharpening companion for anyone who values precision craftsmanship and reliability. Available now at Mjoutdoorsgear UK.

Key Features

• Portable design – folds like a pocket knife for easy carrying
• Two-in-one sharpening surfaces for repair and fine honing
• No water or oil required during sharpening
• Sturdy, long-lasting construction from a trusted Swedish brand
• Ideal for field use, workshops, or at-home maintenance

Specifications

• Brand: Fà¤llkniven
• Model: FS4 Flipstone
• Design: Folding sharpening stone with dual surfaces
• Abrasives: Diamond (25 micron) & Ceramic (1 micron)
• Grit Type: Medium (600–1000) & Ultra Fine (5000+)
• Dimensions: 19 cm total length | 3.5 cm width | 1.1 cm height
• Weight: 65 g
• Material: Durable plastic body with bonded abrasives
• Locking Mechanism: Locks in both folded and open positions
• Water Use: Not required
• Made in: United States
• Warranty: 10 years (materials & manufacturing defects)