Naniwa Diamond Pro 400 Sharpening Stone

The Naniwa Diamond Pro #400 is a professional-grade diamond stone built for the toughest sharpening jobs—repairing chips, resetting bevels, and cutting through hard steels other stones struggle with. We recommend it for efficiently sharpening hard stainless steels like HAP40 and ZDP-189, which cause conventional whetstones to dish quickly; the Diamond Pro's resin-bonded diamond surface stays flat instead. It needs only a splash of water to use, with a small dressing stone included to keep the surface true over years of use.

• Coarse #400 diamond grit designed to repair chips, reset bevels, and reshape blade angles—even on the hardest steels and ceramics
• Resin-bonded diamond layer on a metal base holds its edge and stays flat far longer than traditional whetstones
• Splash-and-go design—just add water, no soaking required
• Includes a small dressing stone to keep the diamond surface flat and performing at its best
• Made in Japan, part of Naniwa's professional-grade Diamond Pro series