To determine the correct size glass shade, simply measure the inner diameter of the shade holder (fitter) on your fixture. Common diameters for shade holders are: 2 1/4", 3 1/4", 4", 6", 10" and 12". Select a shade with a corresponding fitter diameter.
Regarding this, what is a UNO fitter lamp shade?
If your lamp has a harp, you will need a shade with a spider fitter. The spider fitter sits on top of the harp, is secured by a finial, and is integrated in the lampshade. The UNO fitter is built into the lampshade. The Slip type sits on the socket and is held in place by the bulb.
How do you know when a lampshade fits correctly?
Repeat the shape(s) in the lamp body in the shade shape; i.e., a round lamp on a square base can take a shade with a rounded top and square bottom. The diameter of the bottom of the shade should not be greater than the height of the lamp body (to the bottom of the socket).
How do I choose the right size lamp shade?
To figure out the right width for your shade, measure your lamp base and multiply by two. For a round base, measure straight across; measure diagonally for a square base. The widest part of your shade should be at least a half-inch wider than the widest part of your base on each side.