... iron oxdie(Fe3O4) on the Surface,which Increases the wear-resisting and increases the overall life.Suitable for general ... Grinding(Out Diameter>50, the range Of teeth<25, thickness<6)Surface of Cutter: Original colour, black, ... manual, semi-automatic and fully automatic machines.Remark: The Diameter, bore, Thickness, Teeth NO. and surface ... Metal slotting saw with fine pitch pipe cutter circular blade