A-W213778BIMP-AI DISC BRG IMPOne New Aftermarket Replacement Disc Harrow Bearing (Impeller Style) for Agricultural Disc Harrows This aftermarket replacement disc harrow bearing features a 1 1 8" square bore and an impeller style (IMP) design for use on agricultural disc harrows and tillage equipment. The bearing is pre lubricated and spherically self aligning to accommodate minor shaft misalignment during field operation. The heavy duty sealed construction helps protect against