Use as many of these as needed when the wall, for any reason, is too thick causing the mounting plate in the wall and wall plate to not meet. Longer screws will be needed as well. Each extension adds 3/4 of an inch and can be cut to shorter sizes.
DIAMETERS: Large end inner is 1-5/8", outer is 1-7/8". Small end inner is 1-1/2", outer is 1-5/8". If you need a case of these, please enter 50.