Apogee diamond sharpening stone The sharpening surfaces are fixed on a perfectly flat aluminum plate to offer exceptional sharpening quality. OPTIONS: With 2 sides Different grains: 400 – 600 Plate size 11″x 2″ Replaceable Diamond strips size : 4″x 1 1/2″ Deburring tool included   Why use a diamond stone? Diamond stones are the fastest cutting sharpening stones. Speed is especially helpful when working with coarse grits where you may spend additional time on a dull edge. Diamond stones are extremely flat and stay flat over the lifetime of the stone. Advantages and benefits: Apogee Diamond sharpening stones are extremely flat and stay flat over the lifetime of the stone. This is extremely helpful when sharpening tools that require an absolutely flat stone. Diamond stones are also the easiest to maintain, simply dry the stones after use. If diamond stones are properly maintained, meaning they are kept clean and stored dry, they can last a long time. For those that use stones on a daily basis and maintain them properly, the diamond will likely last years. For those that use them regularly, it’s likely the stone will last for a very long time. What is the most aggressive sharpening stone? Diamond stones are the fastest and most aggressive sharpening stones. They are produced by bonding microscopic diamond crystals to flat perforated or solid steel plates. Diamond stones are long lasting, fast sharpening, and will retain their flatness longer than waterstones and benchstones. See other stones format here Know more about Apogee here