lot of primitive old cast iron farm equipment handles

Lot of 8 primitive old cast iron equipment handles from an old farm estate. These have threaded holes for screwing onto threaded rod. They would have been used in the place of a machine nut on wagons and other farm machinery when it needed regular adjustment so they could be tightened and loosened by hand without a wrench.

Seven of these match and one is different. They measure about 4.5" long and are threaded for a 3/8" thread. They have a patina of age and rust.