Aluminum or brass skull shift knob replica from Immortan Joe's Gigahorse vehicle in Mad Max: Fury Road.
Made with lost wax casting out of 100% recycled aluminum or brass.
Can be used as a hood ornament
4 inches tall (10 cm), 2 inches wide (5 cm)
There is a divot on the bottom of the skull. The thread you need can be cut into the skull.
Belt sander, using a grinder with a finger grit flapper wheel. Lots of patience.