12.3 cm x 8.4 cm x 2 cm / 4.8 in x 3.3 in x 0.8 in
A captivating metal lock that needs no key to open. Move the sliding pieces around using the 3 brass pegs in order to open the lock. The sliding pieces inside the front labyrinth are made of metal, however there are wooden inserts sandwiched between the metal plates. This puzzle also has a wooden twin (Schiebeschloss - Wood)
Invented by the prolific puzzle designer Jean Claude Constantin.