Iron Steel Ball Valve Handle for Dn50 Ball Valve,Valve Switch Handle,Ball Valve Handle Accessories(1pcs,Blue 8x12mm)

Look like cast valve handles, would fit over a square shaft with a screw holding it in place. Edit to add link to more modern version: https://www.amazon.com/Steel-Handle-Switch-Accessories-8x12mm/dp/B0BD8459NK