1 1/4″ high x 11/16″ wide x 11/32″ deep (Actual: 1.250″ high x .695″ wide x .330″ deep). All brass except for 2 steel pins. The lock functions exactly like the full sized version, whereby you need to align three dials correctly to unlock it. After the dials are aligned the group of dials drops down allowing the shackle to be turned 90 degrees. There are false gates to frustrate lock pickers This is a miniature rendering of Jerome W. Packard Patent # 550641. July 2013. Only 5 of these locks were made.