Wicked Edge Premium Grit Diamond Stones Pack. These stones are highly aggressive and remove metal quickly so take care when using them. These stones are not suggested for the majority of users. These Diamond Stones have a break-in period of about 20 sharpening sessions and an average lifespan of 700 sharpenings. Specifications for Wicked Edge Premium 50/80 Grit Diamond Stones Pack: Manufacturer: Wicked Edge Grit: 50 80 Extra Coarse Coarse Fabric/Material: Diamond Color: Grey/Black Size: Pair Length: 6 in Width: 2.36 in Height: 1.57 in Overall Length: 6 in Features of Wicked Edge Premium 50/80 Grit Diamond Stones Pack: Grit Range: 50 (extra-coarse) and 80 (coarse) for fast material removal. Use Case: Ideal for re-profiling and major blade repair. Break-In Period: About 20 sharpening sessions. Lifespan: Up to 700 sharpenings per stone. Package Contents: Premium Monocrystalline 50 Grit and 80 Grit Diamond Stones Wicked Edge WE5080: Ultra Coarse 50 Grit / Extra Coarse 80 Grit Diamond Sharpening Stone