The Coarse Red Side (120 grit) will aggressively repair and recondition damaged or dull blades, even works to put an edge where there wasn't before. While the Fine Red Side (600 grit) will produce and maintain a micro-serrated working edge, polishing away the heavy scratches from lower grit stones.  The 600 grit stone produces a working edge that is adequate for nearly any task, especially cutting cardboard. 

A great addition to any craftsman’s workshop, the diamond abrasives on the benchstones are excellent for repairing and maintaining a large range of tools from dull and damaged kitchen knives, to well maintained woodworking chisels.