Cable Matters5-Pack LC UPC Duplex Fiber Optic Keystone Coupler Jack, OM1/OM2/OM3/OM4 Multimode, OS2 Single Mode Support

I do not know why it wants me to rate these on “sheerness” and “stretch”; as far as I can tell, these cannot be used as pantyhose, and even if they could, that’s not what I bought them for. They CAN be used as keystone jack LC fiber couplers, though, and they work fine in that capacity. These are particularly useful because they’ll fit side-by-side in tight keystone configurations, including 6-port Decora plates (which can even be a pain to get Ethernet jacks into) and 24-port rackmount Keystone patch panels like the ones from Monoprice (also sold here). They cost a wee bit more than the standard ones, which are fine if you have a standard 6- or 12-port keystone plate, but these fit basically anywhere.

Added to my new patch panel and had zero issues.

This coupler sits sturdy in my keystone patch panel. It couples two OM3 cables nice and tight. The connection is running at 10Gbps without any problems. It makes the fiber connections look much cleaner with the patch panel setup.

I'm using these as interconnects in a small rack I put together for my NVR. I have them installed in a 1U 16-port Tripp Lite keystone panel. I have no issues using these with my OM4 LC cables. I only have 10G SFP+ transceivers and short, 50 ft runs, but I'm getting full bandwidth and no dropped packets.

I installed these in a rack patch panel, fit perfectly, no degradation of signal.

Works great in my Trendnet patch panel. Using these keystones to clean up my setup. Now I have the fiber cable from my server to one end and the other end to the sfp on my switch.Wish this came in black.

Makes everything looks organized

These are great for the patch panel. Would not recommend using them at the wall plate, because there would be nothing to protect the fiber cable in the jack.