I use them for the two bearings on the sides of the ferris wheel. No real hits for huge Halloween props. They're great for my purpose and they were the cheapest pair of hubs I could find so... They're great for my purpose! If you're using them on a compatible car I don't have any tips or good advice other than that they both came with a pair of knitted gloves (I assume they were included for oil hub work) and it was cool as $#it.