Precision ground inner ring provides a hardened raceway for the rollers when used with an unhardened shaft. The ring contains an oil hole and annular groove for relubrication of the bearing and can be used with both CAGEROL® and GUIDEROL® bearings or can be utilized as a bushing in plain bearing applications. McGill® Machined Separable Inner Ring, Standard, Series: MI Series, 4 in Inside Dia, 4.9985 in Outside Dia, 2.26 in Overall Width, For Use With: GUIDEROL® GR 80, CAGEROL® MR 80 Bearing, Round/Spherical Bore, Lubrication Hole Lubrication Hole, Chrome Steel