DiCUNO Lamp Shade Rings, E26 Light Socket Collar Ring, Black Threaded Reducer 1-3/8 Inches (34mm) and 1-1/2 Inch (39mm), Hanging Lamp Holder Parts,

Why I reached for these

A move across town left me with a small but maddening problem: a floor lamp and a pendant without the collar rings that clamp their shades to the socket. If your fixtures use a threaded E26 socket with an external collar (often called a “UNO” style setup), those rings are essential. I tried a couple of local hardware stores and came up empty. That’s what led me to the DiCUNO rings—a simple, no-frills set meant to replace lost or broken rings across a few common socket diameters.

What’s in the box and build quality

My box included six black rings: two labeled 39 mm, two 34 mm, and two 32 mm. The 34 mm pair is made from PPA and rated to 210°C; the 39 mm pair is bakelite rated to 180°C; the 32 mm pair is an “alternative size” presumably for edge cases. The materials are appropriate to the job: both PPA and bakelite are rigid, heat-tolerant, and electrically insulating. The finish is a matte black that blends into most dark sockets and looks especially tidy on industrial or vintage-style fixtures.

Threading on my set was clean and free of flashing. The 34 mm rings felt slightly lighter and a touch more flexible than the 39 mm bakelite rings, which have that dense, crisp feel bakelite is known for. Either way, these are hand-tightening parts; you don’t want or need to torque them hard.

One note of potential confusion: some listings call this a four-pack, but mine came as a six-ring assortment (two of each size). If you absolutely need a specific combination, check the listing images and details closely.

Installation and fit

Installing the DiCUNO rings is as simple as it gets:

• Unplug the fixture.
• Slip your shade’s UNO fitter (the ring built into the shade) over the socket’s threaded collar.
• Spin the ring on by hand until the shade is snug.

On my pendant, the 34 mm ring was the match. On the floor lamp, the 39 mm ring did the trick. Both seated smoothly and held the shades securely without wobble. I didn’t need to crank them down; finger-tight plus a quarter turn was perfect. If you find the ring backing off over time, a thin fiber washer or a tiny dab of removable thread locker (applied sparingly and well away from any heat source) can help, but I didn’t find it necessary.

The 32 mm rings didn’t fit any of my fixtures, but they’re good to have as insurance if you have a mixed bag of sockets at home or in the shop.

Heat performance in real use

I tested these rings with warm-running LED bulbs as well as an older 60W incandescent. Neither the PPA nor the bakelite showed any softening or discoloration after extended use. The temperature ratings (210°C for PPA, 180°C for bakelite) are well above what a socket ring should see under typical household use, especially if you’re using LEDs. If you run high-wattage incandescents or enclosed fixtures, heat levels climb, so the higher-rated PPA rings are the safer bet. For most modern setups, either material is overkill in a good way.

Compatibility caveats (read this before you buy)

These rings are only for sockets with an external threaded collar of specific diameters—34 mm or 39 mm. Many “medium-base” E26 sockets in the U.S. don’t have that collar at all; they’re designed for shades that attach using a harp and finial. If your socket is smooth below the bulb or relies on a harp, these rings won’t help.

How to check:
- Look for an external threaded section directly below where the bulb screws in. It will look like a short, ridged cylinder.
- Measure the outer diameter of that threaded collar. A caliper is best; a paper strip wrapped around and measured works too. You’re aiming for either about 34 mm or 39 mm.
- Confirm your shade uses a UNO fitter (a built-in ring in the shade opening that slips over the socket), not a spider fitter meant for a harp.

If your measurement lands near 34 mm or 39 mm and you see that threaded collar, the DiCUNO rings are likely a fit. If it’s substantially smaller or larger—or there’s no collar—look to other mounting systems.

Everyday use and small quality-of-life touches

Once installed, the rings are basically invisible. They don’t rattle, and they resist loosening with the on/off jostle that lamps get. The low-profile black finish recedes nicely behind metal and fabric shades alike.

A few small touches I appreciated:
- The threads engage smoothly; no cross-threading drama.
- The material tolerates being removed and reinstalled a few times without the edges chipping.
- Having pairs means you can outfit two fixtures at the same size, not just one.

If you work on lamps regularly, the assortment is handy to keep in a drawer. For a one-off fix, it’s still a quick solution as long as your socket type is compatible.

Tips for a cleaner install

• Hand-tighten only. Overtightening can damage the ring or the socket threads, especially with bakelite.
• If your shade rotates, add a thin fiber washer between the shade’s UNO ring and the socket collar to create friction.
• Use a rubber jar-opener pad or nitrile gloves for extra grip if your fingers slip on the smooth plastic.
• Keep rings away from solvents and strong cleaners; a mild soap wipe is sufficient.

What could be better

• Not universal by design. That’s the nature of socket rings, but it bears repeating: these won’t work on every E26 fixture. Clearer labeling on compatible socket styles would save some guesswork for casual users.
• Size clarity across the listing. My set included six rings (two each of 39 mm, 34 mm, 32 mm), which is ideal, but some product pages list four units. If there’s a standard pack size, that should be consistent to avoid confusion.
• Spare washers would be useful. Including a couple of thin friction washers would help with shade rotation on metal-to-metal setups.

None of these are dealbreakers, but they’re worth knowing before you order.

Value and warranty

As a small hardware purchase, the DiCUNO rings deliver good value by solving a very specific problem without fuss. I like that the pack spans the common sizes and includes duplicates. The stated 3-month refund and 1-year warranty provide a baseline of support, which is more than you get with the generic, no-name rings that show up in bargain bins.

Who they’re for

• DIYers restoring vintage lamps or swapping shades on pendant fixtures with threaded collar sockets.
• Landlords and prop shops that need a quick fix across a variety of older fixtures.
• Anyone missing the little ring that stands between a shade and the trash.

If you don’t have a threaded collar socket, these simply aren’t for you—look instead for harp/finial kits or adapter collars designed for spider-fit shades.

Final recommendation

I recommend the DiCUNO rings. They’re well-made, heat-resistant, and, most importantly, they fit the two collar sizes I encounter most often in threaded E26 sockets. Installation is quick, the finish is unobtrusive, and the inclusion of multiple sizes in one box dramatically improves your chances of getting your lamp or pendant back in service without another trip to the store. Just confirm your socket type and diameter ahead of time; if you’ve got the right style of fixture, these make a straightforward, reliable solution to a surprisingly common problem.