Naniwa 400 Grit Diamond Stone

Ready to Use with a Quick Splash
A light spray of water is all it takes to prepare Naniwa Diamond Pro Stones for sharpening. Their sharpening feel is comparable to the hardest-wearing water stones—neither excessively rough nor overly soft or clay-like. As with all water stones, keep the Diamond Pro Stones wet while in use and allow them to air dry between sharpening sessions.

With dimensions of 210mm (8-1/4") x 75mm (2-7/8") x 16mm (5/8"), these stones are well-suited for sharpening a variety of knives and tools.

For Very Hard Steels and Ceramics

Naniwa Diamond Pro Stones are particularly useful when you want a water stone style sharpener, but are working with extremely hard exotic steel or ceramic. Other stones may be very slow or even ineffective for ceramic or the hardest steel knives, chisels and plane blades, but because they are diamonds, if the abrasive in these stones won't sharpen the edge, nothing will.