Swages? What the heck are swages? blacksmith tools that fit in the Anvil and allow you to shape hot metal by consolidation rather than thinning or dividing . . The half round ones for arriving at known finish diameter or forged Welding three things together. The semi spherical one has a myriad of uses, including making candle cups and pans, and assisting you and forging spheres. Upsetting round hammers just to name a few. These are hand forged in my shop in Edmonton Alberta Canada by me see them

From Raw Metal to Precision Power: The Secret of Rotary Swaging | The Viral Vid