SYRATION 4"x1-1/2" Cast Iron V Groove Caster Wheel with Straight Roller Bearing Capacity up to 600 lbs (1 Black Wheel): Amazon.com: Industrial & Scientific
SKF NUP 220 ECP Cylindrical Roller Bearing, Single Row, Two Piece, Removable Inner Ring, Straight Bore, High Capacity, Normal Clearance, Polyamide/Nylon Cage, Metric, 100mm Bore, 180mm OD, 34mm Width: Amazon.com: Industrial &