The Cuda Marine diamond sharpening stone offers a significantly longer lifespan than conventional whetstones because its diamond-coated surface is extremely abrasion-resistant and, unlike water stones, does not wear down or hollow out. It retains its shape and effectiveness for years, provided it is used without excessive pressure. Besides fishing knives, this sharpening stone is ideal for sharpening kitchen and outdoor knives, steel and carbide tools, as well as for woodworking and stoneworking applications such as chisel sharpening or edge smoothing.