4 3/8″ high x 3.1″ wide x 1″ deep excluding dust guard and bushing. Iron body. Iron shackle. The bushing must be pushed up to free the dust guard which has a nib on the back which slides into the slot on the right. The bushing must then be pushed down to remove the obstruction from the keyway. Closing is in the reverse order; push bushing up, close dust guard then slide bushing down to lock dust guard. Very clever. This is a double chamber lock with 2 shackle bolts.