T-1 (3mm) LED Clip & Ring Set. Black nylon.
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I just happen to have a ton of LEDs with a flattened top that these happen to be perfect for. That said, I've noticed some of the more common rounded-top LEDs are either too small, don't catch on the bottom clips, or stick out too far (to where the user could accidentally push the LED down inside the enclosure). Your mileage may vary, but I'd much rather take my chances with these than screw around with those terrible metal bezels with the unforgiving retainers in the back.