I've come into a number of ball bearings and I'm open to suggestions for projects in which to use them. They are "SKF 6304 2RSJEM Radial/Deep Groove Ball Bearing - Round Bore, 20 mm ID, 52 mm OD, 15 mm Width, Double Sealed, C3 Internal Clearance." I got them from a shuttered company that used to repair grinder pumps.

Maybe make some massive fidget spinners?...