"Lock'd In" is a trick-opening lock that will keep you guessing!
How does one open a lock that has no key-hole? There are no buttons, no tools, and no magnets either... You'll have to rely on your keen senses to feel and hear the hidden parts inside!
The main body is 2" diameter, large enough to handle easily but won't take up too much space in your collection. The Aluminum version weighs about 70g (2.5 oz).
The mechanism is not too difficult and most people will be able to solve it in about 10 minutes.