V Groove Bearing, 10 PCS V624ZZ Metal V Groove Ball Bearing Wheel with Straight Roller Bearing Pulley for Rail Track Linear Motion System (4×13×6mm ): Amazon.com: Industrial & Scientific
Ball Beairngs that have 0.5 Inch OD outer Diameter
51317 SKF axial Rillenkugellager lager 85 x 150 x 49 mm : Amazon.se: Bygg, el & verktyg
SKF 61817-2RS1 Radial Bearing, Single Row, Deep Groove Design, ABEC 1 Precision, Double Sealed, Contact, Normal Clearance, Steel Cage, Metric, 85mm Bore, 110mm OD, 13mm Width: Deep Groove Ball Bearings: Amazon.com: Industrial