4 3/4″ high x 3 1/4″ wide x 1″ deep. Weight: 1.4lbs. Iron body. Iron shackle. “4345” “WILH WEISS KARLSRUHE” is stamped on the bow of the key. There is a spring loaded plate that must be fully depressed to allow the bit of the key to rotate. We believe this is a picking deterrent.