The Norton Flattening Stone was designed to deal with concave wear of all waterstones when honing. A low cost, easy-to-use flattening method for all grit sizes of waterstones. The coarse grit silicon carbide promotes maximum cutting while the diagonal grooves provide a channel for debris to be removed during the flattening process. Engineered for superb flatness with a very hard bond, it produces an extremely flat result on all sizes of Waterstones. Stone measures 9" x 3" x 3/4" and includes a plastic case for storage and easy-to-follow instructions for use and maintenance.