This stone is 37mm high and has a diameter of 100mm.
It is a double sided sharpening stone: grit 150 (brown) on one side and grit 500 (terra cotta) on the other.
Its round shape allows to rotate during sharpening for even regularity.
This stone must be used with an abundance of water.
Results are even more better if one uses non-resinous oil or petrol.