Made out of solid iron.

Keys are used in all sorts of magic, mostly for good luck and unlocking opportunities, also protection, especially Iron keys as Iron is known to ward off evil spirits as spirits can travel through pretty well anything. Blacksmiths were seen as magical doers as they forged things with iron making tools of protection with the fire and their hands. 

Keys are known to unlock gateways, doorways and other realms to the things unknown, mysteries and forbidden things. 

Goddess associated with the key is Hekate and Freya (who are some of the most popular Goddess known)

Also used in Hoodoo, Conjure workings. 

 Size; approximately 7 1/4" long.