IES clips attach to the spider of a lampshade and secure it to the IES bowl. Typically 3-4 clips are needed, depending on the number of "arms" the spider of your shade has. Each clip is sold individually.
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How To Choose The Right Lampshade
Measure your shade
Measurement Shown As: Top x Bottom x Side (Height)
Example: 6 x 12 x 9
If you are replacing an existing lampshade it may help to measure it first. Start by measuring the widest part (diameter) of the top and bottom of your shade, then finish by measuring the slant/height along the side.