HDBT-1-3/16 Drop in Heavy Duty Mounted Carbon Steel Ball Transfer, Stainless Steel, 1-3/16" Diameter, 500 lbs Load Capacity (Case of 4)

The media could not be loaded.  Used these on the bottom of the outdoor furniture I built to make it easier to move around. Drilled a 1 3/4" hole to counter sink them using a Forstner bit with a 1 1/4" depth. Then used a professional grade epoxy glue to seat them. So far they are working like a charm. I'll update review if anything changes.

Bought it and it is definitely heavy duty

great product, heavy construction, shipped promptly, love it , perfect for my needs