Are there standard balls I can get from any hardware store?

Are there standard balls I can get from any hardware store?

The 2” Drop Fixed Height Ball Mount can use any hitch ball with a shank width of 1in or less. The Weigh Safe adjustable drop hitch uses specially shaped trailer hitch balls that allow the hitch to be properly locked in place. Only the included hitch balls or Weigh Safe replacements are compatible with this item.