Key | Grindhouse Key

Sculpted by: Jamie Macfarlane and handpainted by Kate Skelly and Kurt Guilbeau
Release: 2012
Edition: Limited
Used material(s): Cast in bright nickel-plated pewter with black and red enamel
One of: 1000

Signed: Israel Skelton

First appearance: Grindhouse (one-shot)
Use: Opens a door that is all mouth
Door: Feeding Door (?)

More information:
(possible spoilers)

Used in Grindhouse by Mary Locke to get rid of one of the gangsters. See opens a door that contains a pair of vampire-like teeth and a tongue and eats the gangster.  Undiscovered by the current generation.

Source: Locke & Key Wikia