Anvil

An anvil is a metalworking tool consisting of a large block of metal, with a flattened top surface, upon which another object is struck. Anvils are as massive as practical, because the higher their inertia, the more efficiently they cause the energy of striking tools to be transferred to the work piece.

The difference between a 400lb American made anvil with a hardened steel face and a cast iron body, and a 550lb German anvil with a fully hardened steel body made in pieces then forged together https://twitter.com/Rainmaker1973/status/1746509854276039126