This is machined from one piece of steel. The cuts go all the way through so that it rings like a tuning fork. It is 6 inches tall and 6 inches in diameter. It looks like something a machinist would use with a lathe, but it wasn’t found with anything that gives a clue.
A: This is a workholding collet, generally used in a lathe but can also be used on a milling machine with an appropriate collet holding system. This collet looks like it was machined from an emergency collet to hold a specific part.