It looks like you’re referring to “Rising Fly Fishing Diamond Hook File”—a tool designed for sharpening fly fishing hooks. Here’s what you need to know:

What is the Rising Diamond Hook File?
– A high-quality sharpening tool made with industrial-grade diamond abrasive.
– Designed specifically for fly fishing hooks (especially smaller hooks like those used for dry flies, nymphs, etc.).
– Compact, durable, and highly effective for restoring a razor-sharp point on dulled hooks.

Key Features:
✔ Diamond-Coated Surface – Long-lasting abrasive for fast, precise sharpening.
✔ Fine Grit (Usually ~600 Grit) – Ideal for delicate fly hooks without removing too much metal.
✔ Ergonomic Design – Often comes with a rubberized grip or slim profile for easy handling.
✔ Portable – Small enough to fit in a fly fishing vest or pack.

Why Use a Diamond Hook File?
– Extends Hook Life – Saves money by sharpening instead of replacing hooks.
– Better Hook Sets – A sharp hook penetrates faster, reducing lost fish.
– Versatile – Works on stainless steel, forged, and chemically sharpened hooks.

How to Use It:
1. Check Hook Sharpness – Drag the point lightly across a fingernail; if it digs in, it’s sharp.
2. File at the Correct Angle – Match the existing bevel (usually 15–20°) with 5–10 light strokes.
3. Test Again – Ensure the point is sticky-sharp before fishing.

Alternative Options:
– EZE-LAP Diamond Files – Similar quality, different shapes.
– Ceramic Hook Hones – Softer abrasive, good for touch-ups.

Where to Buy?
– Sold at fly fishing specialty shops, Amazon, or directly from Rising’s website (if available).

Rising Fly Fishing Diamond Hook File

Would you like recommendations for other sharpening tools or tips on maintaining fly hooks? Let me know! 🎣