The Mini Hones use high quality monocrystalline diamonds that are mounted on unbreakable, ergonomic, color coded handles. The sharpening area measures 3/4" wide by 2-1/2". They are available in Coarse (325 grit, Blue), Fine (600 grit, Red) and Extra Fine (1200 grit, Green). Overall length is 7". These hones can be used dry or with water as a cutting lubricant.