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This is designed to accept six standard 608 style bearings. (8 x 22 x 7, skateboard bearings)
It also has 1.5mm holes that can accept 1.5mm x 6mm tritium vials for a spinning glow in the dark effect
Note: due to how things print some final production may need done. You want the bearing to be pressed in firmly and tight. Also the holes for the tritium vials will more than likely need to be drilled out to size. The model has the correct sized holes, but due to how 3d printers work material gets stuck in the hole portion. Overall the final production is still very easy. If you need further instruction feel free to message me.