Sculpted by: Jamie Macfarlane
Release: 2017
Edition: Limited, Comic Con
Used material(s): Cast in rusty iron-plated pewter
One of: 250

Signed: Israel Skelton

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