This Crystolon sharpening stone is a long wedge shape stone with four flat sides that are designed for sharpening coarse cutting edges on cutting implements and edged garden tools. Wood handles make them easy to use and they will outlast and out-sharpen metal files. Coarse grit silicon carbide abrasive.  File measures 225 x 50 x 32mm (9″ x 2″ x 1-1/4″) at widest part. Overall length of file is 350mm (14″).