Smith's Diamond retractable sharpener review - really handy little hook and knife sharpener, around £12.00 — Henry Gilbey

Hook Sharpener Hook File Set of 4 Diamond Fishing Hook File Portable Fish Hook Sharpeners with Double Sided Fine and Medium Grit for Saltwater

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DIY Chain saw file, fish hook sharpener for fresh or saltwater by WillCFish Tips and Tricks.

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If you do keep an eye on your hooks and sharpen them regularly, do you actually know how to do it properly? — Henry Gilbey

400 Mesh Fishing Hook Sharpener Pen Sharpener High Quality Outdoor Tool Diamond Pen shaped Knife Sharpener - AliExpress

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QHHVAIT Fishing Hook Sharpener Portable Fishing Hook Hone Sharpener Pocket Fishing Knife Grinding Tool for Saltwater Freshwater : Sports & Outdoors