Flattening your waterstones is an important process for maintaining your stones. This Naniwa Flattening stone is designed to work with Naniwa Waterstones but we've found it works well on any waterstone.
Stone measures 170MM x 55MM x 30MM. If you measure in inches that is roughly 6-11/16" x 2-1/8" x 1-1/8".
Made in Japan.