Hapstone Optimal Bench Stone

A reliable water stone designed for sharpening knives with steel hardness up to 62 HRC. Suitable for EDC, kitchen, and outdoor blades.   Abrasive: Aluminum Oxide Bond: vitrified Lubrication: Water only (no oil) Use: Soak 4–5 minutes before use; spray water during sharpening Result: Even scratch pattern, low clogging, fast and controlled metal removal Maintenance: Easy to clean, pre-lapped and ready to use Specifications:   Working surface: 8 × 2,8" (200 × 70 mm) Abrasive thickness: 10 mm   FEPA JIS Microns (µm) F220 #250 50 µm F400 #600 20 µm F500 #1000 10 µm F1000 #3000 5 µm F1200 #4000 3 µm