Roll-A-Weight new old stock ball casters mid century industrial vintage hardware

2 sets of 4 vintage metal nail on ball casters... new old stock hardware, still on the original cards. These are Roll-A-Weight casters, made in Brooklyn in the 1940s or 1950s. The address on the card is Brooklyn 6, NY.

These casters are about 5/8" across.

Item No. z92033