Naniwa Abrasive is a Japanese manufacturer of high-end sharpening stones for home, commercial and industrial use. With over 60 years of experience, dedication, and innovation, when they say, "cutting-edge technology," they mean it literally!
Model: A-101 | #24Grit Size:170mm x 55mm x 30mm
Model: IO-1122 | #60 Grit Size:170mm x 55mm x 30mm
Model: A-103 | #220 Grit (Long model) Size: 210mm x 55mm x 25mm
Also known as a Truing stone, it is an essentiel tool when it comes to maintaining your stones. When sharpening, it is important to have a flat surface and unfortunately with time, whetstones do wear up but the flattening stones are there as an aggressive abrasive to bring back your stone to a flat surface.