6″ high x 3 1/4″ wide x 1 13/16″ deep. Brass and Iron body. Iron shackle. Instructions to open: Using the key shaped like a socket wrench removes the bottom of the lock. Using the female square key at the bottom allows you to crank the brass section down to reveal another keyhole, as well as a small hole on the side. The small hole requires a screw key to be screwed tight. The revealed keyhole requires a key to be turned clockwise. And now the trick. Moving the fish under the shackle reveals yet another keyhole which requires the smallest key to be turned counterclockwise. Once all three final keys have been worked, the lock will open.