Barely fit into my 18mm CSX
349917
So while I liked the color, unfortunately the pins barely poked through the leather -- this meant a.) I couldn't get my finger to open the pin very well and b.) it barely fit into the watch, not sure if it was secure and c.) the leather was bulging and ginormous within the face.

Lots of no-no's for me, boo. As you can see, requires some force to fit. Had to return.
2342020
Did not fit, the large o-ring hadwas too small in thickness.
1325465
Installed on an AMD-65. After a little Dremel work it fit snug. I also had to modify the front tang for a tighter fit, it is still almost too short to use. Unfortunately, the rail is not a standard size so the optics I had planned on mounting will not fit. I have no idea why it is not a standard size rail.
1699799
I have 18 inch wheels with a 2.5 inch center hole.  These caps measures a tiny bit over 2.5 inches.  The problem was they have a lip and this did not allow them to go far enough into the wheel to snap in place.  I had to do some modifications and grind down the sides in order to get the caps to fit inside the hole so the clips would make contact.  See the attachment pictures -  the grinded caps fit down inside the wheels so the clips could snap in,  this way they will not fall out.

They look nice but it was a pain to make them work.  I thought about sending them back, but after some research they all seem to fit the same and I probably would of ran into the same issue.  However, the end result looks nice I think.
4057323
Part of my issue with these was that, even with the smallest size available, it did not fit my (1971 vintage) steel frame bike (a road-fixie conversion of a track frame).  So, I shimmed it with a piece of aluminum.  But no matter how tightly I clamped it down, and there are limits on how tight you can make it since the bolt attaches to an aluminum piece, it would not hold its position under a hard braking force.  They are not adequate for the intended use.

I had to use a full-length cable sheath instead.  I was fortunate that I had enough in my cable kits to fit.  I am sending these back.
1437302
I bought this item to carry my M4 with a trijicon scope, however it doesn't fit into this, the look and make quality is fine.
4039900
The overall look and quality of the product is good. The inside dimensions published are off. When snapped shut, the I.D. or inside diameter is 3.5mm. I got a 10 pack and I measured them all just to make sure they were all the same size. They were. I purchased them to fit on a .195"(4.9mm) O.D. outside diameter cable and the cable clip broke the jacket when they were snapped on.
1082045
The price seemed great but now I know why. The tolerances are insane. The thinnest is close to 9 mm. One of these "9 mm" sheets measures 11 mm. Bigger is better than too small for my use case so I'm sure they'll be fine, but I was hoping for them to at least all be the same size as each other not 20% variance.
2204373
its okay if you are into watches with 24mm lugs. otherwise its too large, especially for replacement bands and NATOs.
1014242
For some reason my set has two 21mm sockets and no 19mm. I use 19 pretty regularly so this is mildly disappointing. Hopefully we can get this resolved.
1328630
Excellent quality but not really 30mm (much smaller as described and shown on the photos). Unfortunately I can't return it.
747282
They fit my 38mm forks but it was a stretch because they only give you 2 different sized plastic fittings. The bigger fitting are extremely difficult to put on and the small fittings aren't big enough.
1552282
Too small for larger Glocks  and multiple mags.  Does fit my late 80's single stack Star PD with multiple mags very well.
3781493
Little small for a D90,  wouldn't even try to force it because none of the other gear would fit anyway.  Giving it to my wife to use for her sx20is canon.  purchased a pelican 1510 (not sure of that model #), the one with the wheels and adjustable padding. It's nicer, larger, and more user friendly.
496524
So I followed the advice here and ordered a cap 2mm larger than the filter size.  Unfortunately this advice proved to be flawed. The 54mm cap does not fit my Fujinon XF 18mm f2 lens (which uses a 52mm filter).  The Fujinon lenses have a bayonet mount lens shade and there is a ridge on the outside of the lens barrel for the mount.  I intend to reorder after I take a measurement of the lens barrel (hopefully I can get that right without calipers).

Otherwise I like the feel of the lens cap.  Since it is plastic I believe that it will stay on the lens.  This will be a major improvement over the pinch type caps that Fujifilm sells with their XF lenses.  I will update my review when I get the right sized cover.

One other item, if you change to this style of cap, you will no longer be able to store your lens shade on your lens if it has a bayonet style mount on the barrel.
3990282
Maybe I just got a bad kit, but the 3 sizes of adapter rings I needed, 62mm, 72mm and 77mm, NONE of the rings fit.  My primary use was going to be my 105mm Sigma macro lens, but the adapter rings are too loose to fit, they're not even close.  I CAN fit the 72mm ring over the outside of the lens, but no idea how long that will work out.

Working as a macro light, it seems to work OK, as a flash, the sync doesn't seem to be right.  I need to play with it more to see if it's at all useful as a portrait ring light (for those famous ring light eyes effects), but so far it's little more than a barely useable macro light.

I'd recommend going elsewhere.
659123
When I swapped this filter for the OEM one, the fit wasn't exact.  This one is about a quarter of an inch too narrow in my 2006 Lexus RX400h, plenty of room for debris to pass by the filter.  Also, even though the box wasn't damaged, two of the corners were bent and cannot be straightened.  I will upload a picture of a bent corner.