This is an awesome pair of pulls. They are all brass.
The large heavy brass rings measure 1 5/8 inches round. Each one swings from a heavy brass post that is inserted into the wood 3/4 of an inch. A screw is then inserted from the back of the drawer and threads into the post. The brass ringed-pattern back plate is 1 7/8 inches round.
The original screws will be included.