Diameter of the whole unit.... should help you pick which one you need.
let me know if you need other measurements
Hubbz, some of the twist lock bases, in a few years (or models) don't have easily removeable bulbs. Mine had a hole in the bottom (shown) and just pushed right out. I have a set of holders that have no hole, which makes it alot easier. You usually end up crushing the bulb...
sorry for the book/table. lol. my desk is a little covered atm.
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