Superior quality 4.8mm thick blue ceramic discs are one of the best abrasive grinding discs available. The blue grinding discs are of medium/coarse grit working superbly on heavy cuts on damaged cutters without burning. Long lasting stones for automatic machines available in 16mm and 22mm i.d. fitting for .404 chain. 16mm i.d. for Markusson grinding machines. 22mm i.d. for Oregon grinding machines. (N.B. Grinders should only be used by qualified operators. Safety eye goggles must be worn in grinding operations!).
