Voidlock is an interesting lock puzzle from Jean-Claude Constantin.
This is the metal version and the aim is to open the lock but there is no key. You must move the metal slider and pull the mechanism in the correct sequence to unlock. In total this requires more than 300 moves.
Available in both wooden and metal versions, this is the metal verison.
The puzzle measures 101 x 69 x 27mm.
Please note that this puzzle does not come in packaging and the solution is not included.