Fitter:

The fitter is the lip-shaped part of the shade that is inserted into the fixture and held in place by set screws. The fitter size is measured across its full width, including the thickness of the glass. Typical fitter diameters are: 2 1/4", 3 1/4", 4", 6", 10" and 12".

The shade holder on the fixture may also be referred to as the fitter.

To determine the correct size shade for your fixture, simply measure the inner diameter of the shade holder on your fixture. Select a shade with a corresponding fitter diameter. See the diagram at left.

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