The Grindomatic V12 is the original that made its breakthrough in 2003 when rock sawn chains gave the harvester operator problems. With a design as simple as it is ingenious, it has never been easier to get small and large chains sharp with a few quick settings. All Markusson machines are designed so that components can be easily replaced if they wear out. Grindomatic is well used by hundreds of professional foresters and arborists worldwide.