Three sets of three heavy duty casters for studio or location light stands, nine wheels total. These were purchased a good time ago, used very little and then stored. They very solid, in terrific shape and many many years of use in them. They have larger wheels and can be used with heavier lights and are quite solid. They also have a built in brake to lock then in once you get your light or modifier where you want it.
A friend of mine machined six stainless adapters for me so smaller stands would fit without being wobbly or loose. Without the adapter installed, the opening is measuring just over 3/4 on an inch or (about) 23mm. With the stainless bushing installed for smaller stands it is measuring about 18-19mm or a shade under 3/4 of an inch.
$59.00 for all nine (9), shipping might be a trick as these weigh about 960 grams a piece, I looked a couple options and it looks like all nine casters will fit into a large flat rate box which would be $21.10 for shipping in the US.
The closest thing I could find on B&H are 'Impact' casters, (but I have to say I don’t think IMPACT was a brand when I bought them, lol)
Thanks for looking, stay safe everyone!