Instruction: Output yes if the supporting document can answer the given question. Otherwise, output no.

Input:
Question: what dimension am I measuring to determine which size to order?
Document: I initially ordered the wrong size of this product and Upgradelights was very understanding and helpful. I just mailed back the adapters that were too small and they mailed me back the larger ones. It was a very easy transaction.
All I needed was some type of adaptor to convert UNO-style socket lamps to accommodate shades requiring harps. I was hesitant, at first, to order these adaptors but decided to throw caution aside and follow through. There are two different sized adaptors currently being offered through Amazon. I measured my lamp sockets and determined that the smaller of the two adaptors would best accommodate my needs. Adaptors arrived to my mail box in short order.
There must be more than one size standard for Uno lamps. The hole on this one is too small to fit my lamp.
fit my lamp and shade perfectly. For the first time I have a shade on my lamp that doesn't fall over when the cat runs by.
This was the perfect fit for a Pottery Barn Kids floor lamp I have. The harp does not come with it, but those are easy enough to find.
I was skeptical about this part but it works great! Easy to convert a UNO shade mount to a standard harp mount. I'll use this again.
I had an ikea lamp shade with a non-ikea lamp and needed an adapter to utilize the lamp shade. This adapter fit it's purpose. I am very satisfied with this purchase.
Works but needs to be a little tighter and snug in my lampshade. Not sure if it was designed to move like that butAnnoys me that I cannot seem to fasten it perfectly snug where it should be fitted in my lampshade.
I got this in 2 sizes...hope to change out the wobbly kind of shade gizmos that never sit straight! So fo the price it was worth it; if it works I'll get more.
In the process of refinishing a few lamps, I realized that the traditional lamp harp will not work with all types of lamps. This is the perfect solution - it will fit most lamps, and allows a regular lamp harp to snap into it. Highly recommended!
Answer: no