Snake Lock, one of the 12 Animals of the Zodiac. Complete with key, made and works just like in ancient China. There are 12 different animals of the Zodiac Locks. Each one is unique.rnOverall size of these small Zodiac locks is about 1.5 to 1.75 inches long and the latch size can be up to about 7/8ths of an inch. The pin diameter is about 3/16th of an inch.