... copper plating 0.008mmCHARACTERISTIC:1.No or less lubrication is used for handing or cannot add oil ,it neet not maintain orreduce ... course of movement. favorable protection forgrinding bearing no grip appearance.7.Less requirement for grinding bearing, all the bearings that not ... machine, tobacco machine, micro-machine, automobile, motorcycle, agriculture machine. SF-1DU oilless lubricant bearing