Phone: 510.409.0217
Tue–Sat: 9AM – 5PM PST
Superior Japanese Hand Tools for Woodworking, Kitchen, Gardening and Grooming

Business Hours: Tuesday - Saturday  9 a.m. - 5 p.m. (PST)


400 grits
205mm (8-1/8") x 75mm (3") x 25mm (1")
Rockwell Hardness 30
Yellow & White marble color


Soak the stone for about 20 minutes, or until the stone stops producing bubbles. And splash water on the stone as needed.

*Ceramic/High pressure cast and 1300 degree celcius treated

A coarse stone for sharpening dull blades and dressing water stones.


  • March 18, 2020 by Jonathan Kinsey
    I’ve purchased a 400 grit stone and a Tsushima stone. After 25 years of working with Japanese tools I’ve found the best stones available. The 400 grit is a must have !
  • November 30, 2015 by Ben Jermy
    Bought this stone to both refurbish old tools and to take out any nicks in a blade. I have to say this is one of he fastest sharpening materials I have ever used and that includes diamond plates!! I'm not a fan of the skidding feeling you get with a diamond plate. The feeling of this 400 stone is very tactile and suits the hard Japanese steels. Be careful though the steel disappears fast! The very... read more
  • September 8, 2015 by Mihai Radu
    Excellent stone for what it is - very consistent particle size and soft enough for major repairs of those super hard steels. Nicely done. Thank you.